Is this normal?

I don't understand why I'm having so much trouble with life. I am cancer free a junior in high school. Been cancer free for a year. I thought everything would be normal and my life would be back on track but things seem to almost be worst than they have ever been if that's possible. I used to be confident and healthy mentally and physically. Now I'm not in shape because of what happened I'm shy because I'm not confident. I'm watching all my friends get girls and im too un confident to even believe a girl would go near me even though I'm not really that unattractive. I just can't get my life back together I'm really depressed and I feel like I will always be a loser and it's all tied into my experience with cancer it's left me crippled. I feel like I'll never get back up. I want to move on I'm in able to. The nightmares I have and constant reminders wont go away I feel pathetic and weak and I feel like I'm not in control. I want to be out there getting a girl I like again being able to feel good about myself but I have this constant despair that it's too late that I'm doomed to be unhappy alone and miserable for the rest of my life. I'm sad and more than anything angry very very angry all the time and I can't help it and I feel ashamed of the fact that im angry. Unfortunately my dad seems to be a self righteous prick and is basically telling me to suck it up and stop being such a pussy. I handled cancer pretty well going through it but now i feel crippled.