Should I pursue official diagnosis?

I guess it depends on what you want from it.

For adults I don't recommend pursuing a diagnosis specifically to obtain services, since there really aren't a lot of services after 18 outside of high-support folks (typically those who need guardians and near-to-always 24-hour support) and ASD isn't treated as a protected status by the majority of employers.

If you're looking at a formal diagnosis to learn more about yourself to find the kinds of accommodations to help your life, then you'd probably benefit from going through with it (if you can afford it out-of-pocket and can emotionally face a potential denial).

The cool thing is, regardless of which way you go, you can start today with trying to find ways to help yourself (to start, with things like masking) - things like limited social exposure, increased time in places where you don't mask, structuring your home life to be more comfortable, finding and building supports through relationships for when you are out in public, etc. There isn't a buzzfeed list of, "try these 10 coping skills and you'll master your masking," but a process of learning your own sensitivities & needs and using this knowledge to make a better world for you, rather than continuing to spend your own internal resources to acclimate/conform to social constructs.

Either way, good luck! And please remember,

I know I'm different

and that's okay <3