Why do i feel so lost ?

i fell as though all my friends have overtaken me and are moving on to better things and i just stuck behind. I also fell really evious of them because they have so much to be happy for but complain about the stupid things such as - ah no my life is so bad when really i would trade lifes in a heartbeat - ,maybe it is because i am only seeing things from my perspective but i just seem to have many more problems then them and i have really bad " luck" but i know that if i just had the normailty they did that i would be really happy.