Well you cannot be yourself without changing any single things and at the same time fit in any given group. It's just not possible, so you need to let go of that expectation, otherwise you will not be happy.

As for changing yourself:

a) what traits of you annoy others? Are there soem that annoy most of the people, while some overlook them but nobody is really intruiged by them? Then these are harming you and you may want to change them.

b) then there are traits some will hate about you, but some will adore them. Like being loud, being nerdy-nerd, being passionate, being nicety-nice-goodie-two-shoes (believe me, there are people who are put off by that, even if many consider such people good and nice...). Then it's up to you. Maybe you need to tone it down at jobs and family reunions, because you don't want cause yourself unnecessary trouble.

Not everybody will like you. You don't have to trip over yourself to try to fit in... but accept the fact you are different from some and they will wonder about why you are such way. Some people are also snarky and teasing and they don't mean it in negative way.... it's just... how they are.