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

** Practice Mindfulness of Body ---------------------------- ** 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.