These days I feel like It's better off for me if I talk to and befriend people with the same issues as me, SA for example.
Somehow I feel left out and not fitting in if I befriend "regular" people. Is anyone feeling the same as me?
It's completely understandable to feel that way. Being around "regular" people can feel like a high wire act if you have social anxiety. You tend to be overly cautious not to do anything that makes whatever awkwardness one might have stand out and potentially be mocked or humiliated. So it would make sense that being around others with the same anxiety feels less stressful because you're presumably around someone who understands, can possibly sympathize and at the very least won't make fun of you or humiliate you for something they themself have. However, some people with social anxiety tend to lack certain social skills and can just as easily be as challenging to deal with because their anxiety can make them less self aware, more selfish, extremely shy and unresponsive, uncomfortably honest, etc. On the flipside, they can also be delightful, welcoming and a whole host of positive things, too.
Having discovered, developed and understood more about my own social anxiety over the past 15 years, I've become more comfortable around "regular" people. I can play the part of a "regular" person in social situations all the while being inwardly anxious. Though I desire companionship, I still prefer being alone most of the time. Were I to socialize, I think I could be friends with "regular" people. So long as they liked my personality, I think a slow integration of who I really am and a patient education of my anxieties would help them understand and be cool with it. And who's to say that a person that seems "regular" to you isn't internally struggling with their own anxiety.
Btw, have you befriended with anyone with social anxiety?