Can’t really stand my bsf anymore

So, for context I have bestfriend for more than 8 years. We were each other’s milestone pal for so long and we were really close for a long time. And then high school happened and we kinda drifted apart a bit, because for 2 years we were in different classes(we were still kinda close by this time). And after those two years we finally had a chance to be in the same class (mind you i switched classes for her). And for some reason since the year where we were in the same class we drifted apart even more? Like at some point during the year it was awkward for us to talk to each other. And she practically had a new best friend and everything then, and whenever I was around I was practically near non-existent to her. And because of that, I was practically closer to a loner than a loner is. Also because of that I’ve developed this weird thing where eye contact with people is hard for me now, as well as talking (i started stuttering more), feeling drained, and i can’t get my points across as easy as before.

So yeah, I’ve been brainstorming ways to cut her off like gradually without making it too evident lol because I really cannot stand the drama of a confrontation lol.