I'm an extroverted introvert

when I'm comfortable w ppl I can be really outgoing. But when I don't know someone I'm super quite. It's not that I'm shy it's more like I hate small talk. Or when people try to get to know me questions. I've tried opening up and often times people barely respond. So I think it's just better to not talk at all. I only talk to the people who I know. And this year none of the people ik are my lunch . I've been using my lunch in the library bc I tried meeting new ppl and I felt uncomfortable and anxious. Any tips besides opening up???