Its very good question. Im feeling simillar, by stuttering I was avoiding socialising, social anxiety dont helped. Feeling kinda regretful of not socialising or talking with girls at school, when they started first. Overall I think Im more introvert, like I dont party bars with loud music, cigaretts, over sexualised people - like I would prefer to focus on personality more first, rather than first thing I gonna see its sexual stuff rather than personality. As other suggested try to do small talk with people, smile more, maybe wish nice day to a cashier, say nice words like great shoes, nice style, nice hair color maybe it will lead to some small talk, you can then talk about hobby and ask for meetup. Do school have some hobby clubs? You can try it, at least you would meet more familiar people. It can be library events, maybe some sports, volunteer. But honestly Im not sure, if people would mock you for stuttering leave them. Many people have some flaws. I mean one side of me would like to socialise, but other one is comfortable sitting at home playing games