Everyone keeps telling me to find new friends because my current ones never text me first but my social anxiety is too high to try and make new friends. Like I physically can’t.

I’m 17M and in person I’m fine with my current friend group but outside they never initiate. I stutter and they are the only people in my class who acctually sit next to me and talk to me. Everyone else just ignores me at school. So how do I go from just a friendly acquaintance to a close friend? I’m not saying we aren’t friends because I do think we are, I’m just saying I don’t understand why they aren’t ever texting me first.