wrenbow
elusive critter
If you want an official diagnosis in order to get accommodations or simply for your own peace of mind then it can be good idea, but there's a reason self-diagnosis is so accepted within the community!
The current method for diagnosing autism is pretty outdated and pathologising and is very much based on stereotypes so it's especially poor at detecting autism in high-masking adults. A lot of medical professionals also don't know much about autism outside of stereotypes so you can get turned away just because you can make eye contact and hold a conversation, or even because you're a woman and they still think women can't be autistic.
There's also unfortunately not much that you get out of a diagnosis. There's not much help available unless you need accommodations at work (which you can sometimes get just by asking) or disability benefits (which I'm not sure are guaranteed even with a diagnosis), and otherwise it's just a mark on your medical record which you may not want to have for various reasons. So basically unless it's necessary or you really want it, for many people it's not really worth a ridiculously long waiting list and/or paying a huge amount of money to pursue one.
I think if you've properly done your research and you're confident that you're autistic, especially if you have therapists agreeing with you, then there's honestly a very low chance that you're wrong and there would be nothing wrong with referring to yourself as such. Even if you don't feel comfortable with the label, there's nothing stopping you from using tips and resources for autistic people if they give you the help you need. Personally I've found the most helpful resource to be the autistic community itself. People are always sharing personal experiences, studies, coping mechanisms and other information, and all of this is accessible to anyone who needs it.
There's so much more I could say but this has already got really long. Basically you can obviously still seek a diagnosis if you want, but don't worry about it too much because the things that will likely help you the most don't require one and you'll still be accepted in the community regardless. If you're still not sure then I would just do some more research and give yourself more time to determine whether this is the best explanation for what you're going through. I hope you figure it out!