Misdiagnosis

I have an official diagnosis of autism but the last couple of years I've been wondering if the diagnosis is wrong. I don't have difficulty with social interaction and I make friends easily. I do struggle with making eye contact but I only seem to exhibit a few autistic symptoms. I'm wondering if I just have generalised anxiety disorder as anxiety is what I struggle with most of all. I know there not a lot I can do about this it's just a question I keep asking myself now. At the start of September I'll be starting my first job, I'm hopeful it will be a success. I already did a trial day a few months back and I did really well, chatted, laughed and shook hands. I was fine, a little anxious admittedly but I coped. 

I feel a bit of a fake now though I'm aware I could still be autistic but I do feel that I might not be. Does anyone know any online tests that could give me a good idea if I am autistic or not?