If you believe the problem is with "everyone else", the problem really is with you. Nerds generally struggle with holding conversations without constantly sending "out-group" signals while failing to send "in-group" signals.
https://www.youtube.com/watch?v=6yN2H3--1aw
Unlike in this satirical clip, I don't think it's possible to fake being "a normal guy". However, in my experience, it's possible to build rapport by being respectful and signaling that you get where the other person is coming from. Avoid being intellectually dominating. That way, you'll be perceived as "that okay smart guy" instead of "that fucking nerd".
Even if you don't care about being popular, learning how to read people is an extremely important skill, especially if you're somewhere on the autism spectrum. Just approach it as another nerd subject (human psychology).