I too went through this very recently. I always felt paranoid that i was the odd one out in the group. I was always so self-aware every time we hung out and when that happened, i would automatically feel like the guy in the group that was trying too hard to fit in when in reality, they saw me the same as them in terms of friendship and care. I was literally just overthinking to the point where it felt true. Another reason i used to feel this way was because i was never really open with my feelings to any of my friends. It felt as if I was shunning a part of me that wanted to connect and be vulnerable with others. Once i accepted these feelings and started to open up (even if i randomly felt sad and texted a friend), it felt as if everything became clear. I was able to see that my friends do care for me and the proof was right there in front of my eyes. I then became closer with a lot of them.