being alone

Hey, Im a 16 YO who started soccer/football around a year ago, so im not that good at the sport due to my lack of experience. So, to try to make the school varsity team, I generally go to school to train by myself as I live quite close to my school. But my school is always quite busy, but I can always find a few areas of space where I can train. However, I really can't train whenever someone is near where I am training as i think they're watching me and talking smack about how bad I am. I also already feel weirded out since theres not a lot of folks my age training by themselves like this as football is a sport that most start, and stick with when young. Is there anyway to get past this feeling?