I need advice

I’ve always been shy my whole life as a child, I’m 18 now. I still find myself strayed away from a crowd of people, I dont post on social media very much because I’m scared of what people will think. I just struggle a lot with it. I think it may be anxiety but I don’t know. I want to talk to my parents about it but I don’t want them getting upset with me. I need some advice... it affects me a lot, on a daily basis. It is just getting worse and I don’t enjoy the things I used to enjoy:(