First, read here:
Next...remember, you're a naturalbadass...if your handle here wasn't some kind of way to makeup for personal insecurity, you'll do fine.
If it was...then, odds are you're tons smaller than the other guys. If you're not, then you have nothing to worry about, if you hit them harder than they hit you, they lose, you win. Very simple physics.
I was small too playing football. I got run over a lot. but if you keep getting back up you have a strong heart. overtime hitting drills work. lifting weights like crazy. my sophomore year I got moved to linebacker because of my work ethic. let the others fear you. take a hit and give a hit. wrapup and dont let go. in most part smile when you take a hit or give one. never show your scared or weak.
It's intimidating. It's suppose to be. That's why football is so popular, because only the tough do it. To get over your fear, you just have to do what it takes to get over any fear. Face it over and over.
You have to not worry too much about getting hurt or about hurting the other guy. If you're going to play the sport, you will get hurt, and you will hurt others. If that's a problem for you, switch to soccer, basketball or baseball.