As u can see by the title my bellend is still quite sensitive I can retract my foreskin back (but not all the way when erect) and I'm about 5".5-6" and am kinda scared about sex and whether or not it'll hurt and don't give me dumb answers like your too young to think of this stuff I just wanna know
It's normal for the head to be sensitive. It's been covered for most of your life and the nerves just aren't used to being touched. Try to keep it uncovered some. Eventually it will be less sensitive.
Keep working on stretching your foreskin. By about 16 it should retract when you are erect.
Average for an adult male is 5 - 5 1/2" so you're there and still growing.
Hope it helps.