What made you realise you have/might have autism?

Hey all, hope this is okay to post.

I’ve recently started to realise I may have autism - I originally thought it was ADHD but when I started looking at the crossover I realise that autism might be playing a role too!

I was just wondering what were the signs that originally made you realise you have/might have autism? Especially if you were diagnosed as an adult rather than as a child.

And a follow on question - looking back what did you do as a child that was likely due to autism? I want to get tested but seeing other peoples experiences I’m worried about the process - my memory is so rubbish I’m worried they’ll think I’m just wasting their time.

Thanks in advance!