Help Me Choose which meditation i Should do Anapanasati or Brahmaviharas? I have been going through this dilemma for almost a year now in choosing a meditation object..

I only wish to take one meditation object.The reason being i maintain this object through out the day and i gather momentum with it.I noticed if i practice two meditations even if it's very short i lose momentum with my previous one.I think because i've inclined the mind towards one object so when it switches i am not developing much concentration.

The main problem i have is i really love and enjoy anapanasati.Piti and sukha are quite developed so i enjoy it very much and can sit longer. I can gather momentum,its relatively easy to turn my attention to the breath through out the day..now here's the bad part... MY EXTERNAL situations in life just seem bleak,unfriendly,uninspiring,lonely,dull i start getting emptier and emptier like less socialising less entertainments moving towards like a letting go type of life it's freeing and a relief  except nobody is friendly around me.Like things are just DRY and uninspiring around me.

On the other hand when i practice Brahmaviharas,the result are immediate and everything around me is great,people are friendly,i feel protected from harm,pleasant situations.HOWEVER,i don't really prefer this meditation object because it's tiring and i can't sustain it through out the day repeating phrases.Its tiring basically.Also it's not as still as anapanasati which i prefer but if i don't practice the brahmaviharas life just gets very bleak very fast.When i do practice even for 5 minutes everythings just annoyingly great and sugary sweet.Its really wearing me out trying to choose.

Should i just ignore being afraid of unpleasant situations and emptiness/seclusion and incline the mind towards the breath which i know i can make progress or should i just do brahamaviharas and keep everything around me happy?

Thanks
Brahmaviharas is a lower type of meditation than Anapanasati. In Brahmaviharas you use your intellect, to make up suggestions or narratives, that condition your point of view a certain way. In Anapanasati you don't use your intellect to generate anything, you just let go of hangups and let them dissolve. Anapanasati is more direct.

The Buddha said, we don't have to rush to finish the with-intellect meditation and jump to the direct. In fact, he said we should max out the first type until we had enough of it at which point it would seem too artificial. I think that's exactly where you are at. 

So at this point it makes sense for you to do Anapanasati. However, it sounds like you misunderstand what that means. Anapanasati is not just watching your breath and disconnecting from the world. It is using the breath as a focal point for directly seeing your mind, and cutting through any negative thoughts that assault you.

The end result is that you come back to a fresh open mind, as if you have just awoke.