searching a better part of me

I'm not feeling good with myself for those days.
I don't know why it happened.
Feel like everything I've done is not satisfied me.
I should do something that may make me proud to myself.
I'm getting jealous when heard about my friend's achievement..
I want to be like them!
The question that always appear in my mind is
"why I can't be just like them?"
What should i do?
Am i someone that does not know the thankfulness?
I don't think so..
I'm just out to find a better part and looking for special things inside of me..
I want to be 'someone' to get a better life in this small world