How to prevent fear of being made fun of?

So my parents want me to go to a institute and start playing football, because I'm overweight and they want me to get active and all that, but the problem is ive never played it before, and I don't know how to, so I'm scared that people there will make fun of me etc, so I'm scared to go there but my parents are forcing me daily 😭 idk what to do?