Seeking advice on possible ADHD and autism diagnosis

Not really sure what I’m hoping to get out of this post but: in the past few years I’ve realized that my brain doesn’t work like most peoples and I have done a lot of research into adhd and autism (these have both been suggested by people in my life). I feel like a good number of symptoms of both apply to me but I’m also afraid that I’m convincing myself that they do just so I can have an answer. I scored very high on the RAADS-r test but I know that it isn’t the most accurate. I guess I’m asking if anyone had any suggestions? I have thought about trying to get a professional evaluation but it’s very expensive. Ideas?