I’m scared of the potential effects of alcohol, what do I do?

For context I’m 18m, I live in Scotland, where people my age and underage people as young as 13 drink heavily. I’ve never touched alcohol, I don’t plan to. I’ve got dyspraxia, which can make me addicted to stuff easily. I’m already in therapy for caffeine addiction. I don’t wanna touch alcohol because I’m terrified of what I’ll do whilst under the influence. All my friends are now 18 and they haven’t drank either so it’s not like they’re peer pressuring me but they’re gently encouraging me to drink, I’ve not told them that I’m scared of it but I have no idea what to do.