I hate giving sexual advice to a 16 year old but if it helps to make you feel better, i will.
You are swollen because of the rough sex. It's like punching someone repeatedly, it will swell. Also, it sounds like you weren't wet enough, if you were, you wouldn't be in pain as much.
To make your self feel better, take hot soaks in the tub and don't use soap down there for a while, soap will make it sting. Wear sweats not tight jeans and keep it clean.
I noticed you said that you didn't use a condom!!!!!!! WHY NOT? If your uncomfortable now with swollen lady lumps, your gonna really be unhappy with a swollen belly. Condoms are 4.00 a pack at Walgreens compared to thousands and thousands of dollars to raise a kid until they are 18, and that's not including college.
Do yourself a favor, get on birthcontrol. Planned Parenthood is a good place to start.