Inferiority because of failure in meditation I've tried hard to practice meditation - Anapansatti &amp; Vipassana but I just can't concentrate on my breath. Now, I'm feeling inferior as if I can never concentrate my breath or get rid of my inner problems/ sufferings. I feel as if peace or enlightenment or eradication of suffering is not for me. 

After proper analysis, I've found that I just simply can't concentrate. So my questions are


What are necessary &amp; sufficient condition to get enlightened? If I don't have those qualities how can I develop those qualities? What I would have to do?
How to concentrate provided I have tried my best to concentrate my breathing but mind wanders away in no time. It is making me sick thinking I don't posses qualities to eradicate my own sufferings. It makes me feel as if I will never be at peace. 


Note: I have been into 10 days Vipassana course also. 

Anyone help me.
as i see it in OP based solely on content of his post.


  The faculty of conviction - seems to appear 
  The faculty of persistence - seems to appear 
  The faculty of mindfulness - seems to appear
  The faculty of concentration - self reported weak
  The faculty of discernment - seems to appear


Indriya-vibhanga Sutta: Analysis of the Mental Faculties 

On concentration:


  "And what is the faculty of concentration?  There is the case where a
  monk, a disciple of the noble ones, making it his object to let go,
  attains concentration, attains singleness of mind. 


So it has attainment of singleness of mind as property of mind.

So how to develope it:
https://suttacentral.net/en/ma42


  At that time, the Venerable Ānanda rose from his seat of repose in the
  afternoon and went to Buddha. He bowed his head at his feet and then
  withdrew to sit at one side. He said: “World Honored One, what is the
  meaning of this: ‘to keep precepts’?”
  
  The World Honored One replied: “Ānanda, the meaning of keeping the
  precepts is to bring about non-regret. Ānanda, if someone were to keep
  the precepts, he would readily attain non-regret.”


https://suttacentral.net/en/an10.2


  (1)–(2) “Bhikkhus, for a virtuous person, one whose behavior is
  virtuous, no volition need be exerted: ‘Let non-regret arise in me.’
  It is natural that non-regret arises in a virtuous person, one whose
  behavior is virtuous.
  
  (3) “For one without regret no volition need be exerted: ‘Let joy
  arise in me.’ It is natural that joy arises in one without regret.
  
  (4) “For one who is joyful no volition need be exerted: ‘Let rapture
  arise in me.’ It is natural that rapture arises in one who is joyful.
  
  (5) “For one with a rapturous mind no volition need be exerted: ‘Let
  my body be tranquil.’ It is natural that the body of one with a
  rapturous mind is tranquil.
  
  (6) “For one tranquil in body no volition need be exerted: ‘Let me
  feel pleasure.’ It is natural that one tranquil in body feels
  pleasure.
  
  (7) “For one feeling pleasure no volition need be exerted: ‘Let my
  mind be concentrated.’ It is natural that the mind of one feeling
  pleasure is concentrated.


Later again from Meanings Sutta but it fit here more in this post:


  Again, he asked: “World Honored One, what is the meaning of this:
  ‘concentration’?”
  
  The World Honored One replied: “Ānanda, the meaning of concentration
  is to bring about seeing according to reality and knowing according to
  reality. Ānanda, if someone were to be concentrated, he would readily
  attain the seeing that is according to reality and the knowing that is
  according to reality.”


Else?

For developing  of non-distractiveness association with people collected in mind, avoiding restless people and mindfulness of arising and ceasing of phenomena in general according to Buddhagosa s commentary

I think this is it for your concentration problem OP, dont think i have to state the seemingly obvious in regards to your leaks:)

In regards to feeling inferior, 


  there is no competition in search for peace


i heard that

Also this

Sarakaani Sutta:


  "Take the case of another man. He is not even endowed with unwavering
  devotion to the Buddha, the Dhamma, the Sangha. He is not joyous and
  swift in wisdom and has not gained release. But perhaps he has these
  things: the faculty of faith, of energy, of mindfulness, of
  concentration, of wisdom. And the things proclaimed by the Tathaagata
  are moderately approved by him with insight. That man does not go to
  the realm of hungry ghosts, to the downfall, to the evil way, to
  states of woe.
  
  "Take the case of another man. He is not even endowed with unwavering
  devotion to the Buddha, the Dhamma, the Sangha. He is not joyous and
  swift in wisdom and has not gained release. But he has just these
  things: the faculty of faith, of energy, of mindfulness, of
  concentration, of wisdom. Yet if he has merely faith, merely affection
  for the Tathaagata, that man, too, does not go to... states of woe.


On Vi:

When training Satipatthana it is not the objective to get well-concentrated, the concentration comes in succession and has its role and appropriate function. IE it also is involved as a causal condition for people attaching to certain states and that hinders progress.

Sati as a factor of Enlightenment, translated as mindfuless has function of remembering or keeping in mind, re-cognizing. Mindfulness of physical and mental states arising of and within a body is a single theme for the mind, which will develope concentration faculty no problem.

It seems to me that you could try paying more attention to arising and passing of states of "disliking", "wanting/liking", "sadness/despair", "judging/evaluating", "doubting" and "thinking/wondering" as well as "knowing", knowing ie when your concentration is low you can know it as "my concentration is weak", then maybe "disliking?;)" or "wanting" for it to be better or "evaluating" that it makes you a bad meditator, should note that your are thinking at this point and see where it goes from there. You see it will keep you within the theme of mindfulness of the body, conditioning victory.