Most people spend their entire life imprisoned within the confines of their own thoughts. They never go beyond a narrow, mind-made, personalized sense of self that is conditioned by the past.
They forget to live in the present and hurt himself remembering the past or some mistake of that past.
Past is gone and you may have a very happy future if you see the life is very beautiful if you enjoy each present moment of it. I have seen all my friends and the people around me always tells me about the worries, tensions, and problems in their life but no friend of mine tried to talk about the happiness and this beautiful life what god or nature or our parents has gifted.
Life is so beautiful but only few of us tastes it in the real life. Why don't you love your life and say yourself "Lets Love Life" & "Lets love present" :)