Sore and red penis. Also penis foreskin cant be retracted far enough for sexual activity.

Hi, im 17 and im soon going to be sexually active. I went to allt hese different websites to solve this issue im having but no one will help. My penis head and foreskin are bright red and are really sore. It hurts and is really embarrassing. I suffered form tight foreskin so i did all of the stretching excercises. I can pull back my foreskin when erect but can only pull back my foreskin just barley past my head of my penis when erect. Also there is this little bridge of skin from my head of my penis to my foreskin thats restricting me to pull back my foreskin. Why is my penis sore, red and in pain whenever i touch it and pull back my foreskin and why cant i pull back my foreskin when erect and what is that little bridge of skin. Also how can i fix these problems? Sorry for my poor grammar im just lazy to type like an educated young man. Last thing i forgot ot mention, is teh red sorenss form too much masturbation and how long should i lay off slapping the ham for a while for it to heal? I want this to get solved soon because it really is having a toll on my confidence and self consiousness.