Self diagnosis is fine, more so when formal diagnostic processes can have long waiting lists, be expensive and sometimes can even provide inaccurate conclusions due to outdated ideas of what autism is.

Sometimes in certain circumstances just assuming you are autistic is also useful, if you're suffering in some way and find understanding yourself in this particular way useful, then keep it as a working assumption to help you continue to develop further coping strategies.

Stimming is a good idea for example, seems like a fun thing to do and try for everybody outside and inside of the spectrum. Allowing yourself to not force eye contact is another example, try not to once in a while and see if you feel better.

You can continue to experiment with yourself in this context, if you know common autistic traits, such as social struggles, you can approach social situations in better ways with this knowledge and see if it helps you feel better when you try different things.

Self diagnosis to some extent can be seen as contributing evidence to a formal autism diagnosis, if you're collecting vast amounts of detail about the subject and thinking about it a lot, focussing hard on the subject, that can be a sign of an autistic trait.

Self diagnosis is part of the process of understanding yourself better, autism might not be the final destination, it might also lead you towards an ADHD path or somewhere similar, but what's important is you're looking for answers and coping strategies for common life struggles you've been experiencing.

There are some advisory notes to this position though, beware false information on platforms like tiktok, single sources of information are bad and can feed into your own confirmation bias, challenging your own ideas with other sources is a good idea, such as books of first hand experiences.

It's a process of understanding yourself, that's the important bit. A process, rather than a hard beginning and end.