Friends

I’m a senior this year and I have no friends. I’m in clubs and stuff and I’m friendly with all those people and I chat in class. Idk how to just pick someone out and ask them to hang out with me. It takes me a while to warm up to people, I’m aware of that, but I really struggle to maintain any friendships because of it. Any advice? idk what to do anymore, I like my alone time but I can only handle it so much. I’m not really a drinker so its hard to find a group of people I like that don’t solely drink or smoke together