Autism isn't a mental illness, and it can't be 'cured', although some people are very severely affected and may need ongoing help
It's just a different way of being, and covers a huge spectrum. It's also very much more common than realised.
Children with severe autism need, and receive specialist help, but those mildly affected are often not recognised, and are merely viewed as maybe a bit eccentric. My son is high-functioning Aspergers, and has felt much more comfortable with life since that was confirmed.
He gained a good degree and is head of a large design company, so he's a bright fella, but he did have problems socially, especially as a child. He often says that he recognises his own peculiarities, but being an artist, its expected that he's a little unusual.
If you are an older person and can't get access to diagnosis, there is a wealth of information online about the very many successful people who are 'on the spectrum'.
You dont need to be cured, but you have to learn self-acceptance and a certain amount of coping strategies for situations which you find particularly difficult. If you are really struggling or becoming depressed, you may be able to find NHS help, but there are some very good self-referral mental health sites online - they differ from area to area.
I wish you good luck in finding yourself - you are not wrong or ill - you just see things differently and that can be a gift.