I feel the same way a lot of the time. I have to remind myself that I'm just a different type of personality, and that my way isn't wrong- it's just not the same as others. It is hard, though, when I'm feeling like I'm always on the outside looking in. Fitting in seems effortless for other people, but it isn't for me and I've come to accept that it is okay, and I'm okay. Looking into personalities really helped me- I found out that my type is more rare, so it's a simple case of being an unusual person (and so it's harder to find people I click with).

Most online tests aren't super accurate (they're just a basic quiz that can be affected by mood, etc), but lengthy research into MBTI and the different functions really helped me be confident about my quirks. I can't post links yet because I'm new, but if you google "MBTI," lots of resources come up. 16 Personalities is a good one.