Being "Present" with the help of body sensations then how to proceed? **

Practice Mindfulness of Body

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I'm trying to being present with the help of body sensations.

As I'm a beginner . I place my hand over my chest to feel that I'm live and presence. This is to ensure that I do not "think" that I'm being present but as a fact I'm .

After few minutes , I do feel tightness of my heart , breathing rhythm. Then starts to feel energy flow (tingling) inside my legs and Torso .This is like being my attention expanded beyond the chest .  When thoughts come I bring my attention back to chest .

Of course I feel a calm state but it is again a temporary state . The moment I release my attention to include whole environment again it keeps going to whatever it "wishes" to be with .

Could anyone help me with the next step that could help me to keep my attention where I wish it to be ? to ensure I would not identify with unnecessary feelings , emotions etc.
This essay on A Guided Meditation by Thanissaro Bhikku can help you.

I include a quote here:


  If your mind wanders off, gently bring it right back. If it wanders
  off ten times, a hundred times, bring it back ten times, a hundred
  times. Don't give in. This quality is called ardency. In other words,
  as soon as you realize that the mind has slipped away, you bring it
  right back. You don't spend time aimlessly sniffing at the flowers,
  looking at the sky, or listening to the birds. You've got work to do:
  work in learning how to breathe comfortably, how to let the mind
  settle down in a good space here in the present moment.
  
  When the breath starts feeling comfortable, you can start exploring it
  in other areas of the body. If you simply stay with the comfortable
  breath in a narrow range, you'll tend to doze off. So consciously
  expand your awareness. A good place to focus first is right around the
  navel. Locate that part of the body in your awareness: where is it
  right now? Then notice: how does it feel there as you breathe in? How
  does it feel when you breathe out? Watch it for a couple of breaths,
  and notice if there's any sense of tension or tightness in that part
  of the body, either with the in-breath or with the out-breath. Is it
  tensing up as you breathe in? Are you holding onto the tension as you
  breathe out? Are you putting too much force on the out-breath? If you
  catch yourself doing any of these things, just relax. Think of that
  tension dissolving away in the sensation of the in-breath, the
  sensation of the out-breath. If you want, you can think of the breath
  energy coming into the body right there at the navel, working through
  any tension or tightness that you might feel there ...