well I got some normal size condoms and tried to put one on for fun. i'm uncut and couldn't get it over the part of my foreskin rolled back. does that mean it's too small? my girth is a little over 6in
The condom might be too small, and you might want to try a bigger size condom to see if size is an issue. For example, Trojan makes larger condoms called Magnums which are designed for larger penises, and you should give them a try. If you still cannot fit into the large size condoms, then you might have issues with your foreskin. However, before we go down that road try the large size condoms first and see what happens. Finally, when you buy condoms make sure that you get the lubricated ones as they feel the best.
After writing all of this I just noticed that you are 14. Please don't think my advice on condoms is an encouragement in anyway for someone of your age to have sex. I can understand your curiosity to try out condoms, but wait until you are older before even thinking about having sex.
Perhaps you really are meant for a small but didn't try hard enough
If his girth is over 6 inches, he ain't meant for a small.
Six inches (assuming you're measuring right) will require a larger condom. If it's so tight that you can't get it over your penis when your foreskin's retracted (which adds only a little girth), you may very well need a slightly larger size. If I were you, I'd go shopping and try out a few brands to see what works best.
if your girth is over 6 inches then try to trojan magnum, black box gold writing which is what I use. Maybe even the next size up because I'm not six inches in girl, I'm more like five. But the Trojan magnum works for me and I'm almost seven inches and a girth of five. So If your around that, try those.