I need help

I admit that I'm having such a hard time in med. I don't know if I could do this.. I don't know what I'm doing. I don't know if what I'm doing is right. I just don't know! This uncertainty is killing me. I don't know when will be the day that I'll be able to figure this all out. I don't know if I'm ever going to make it. For now I'm just going to continue to review and study until all my hard work will be paid of or will it ever be paid? Over thinking certainly drives me mad. I'm just going to let go and probably just do my best and I'll just see where its going to lead me. I'm going to expect because it usually ends up to frustration and depression. I DONE depressing! I don't want to spend most of my life depress so like I said I'm letting go. Whatever happens happen and I'm just going to accept it the way it is presented. I'm going to be patient and I'm going to trust God that he has a plan for me and at the end of the day I will be happy. =)