@jrsinct I’m also 17. I’m 5’5 and around 160-165 lbs, used to play football and have always had a stronger build. There was a weightlifting unit in one of my gym classes and a lot of the girls (including me) felt self conscious about how much weight they were lifting, if they were doing it right, etc.
The most important thing is to not let any of them bother you. If you’re allowed to listen to music, I highly recommend it. You are allowed, just as much as they are, to take up space and use the weights.
Personal example, but at the beginning of the year, I could barely bench the bar. Going in every week and working at it, progressing my lifts and ignoring the little knot in my stomach when I “took” a bench from a dude who could easily bench press my body weight was what allowed me to get stronger, both mentally and physically.
Also, most of the gym bros will be too busy trying to either impress their friends or the ~girls~ to judge you for lifting 20 lbs. Just take deep breaths and repeat that you’ve got just as much a right to the equipment as they do, and you’ll eventually pass through that wall of discomfort every time you go in. Good luck!