How can I tell if I have autism or social anxiety?

It’s hard for me to figure out if I have autism or just social anxiety, I was diagnosed with anxiety as a teenager and not diagnosed with autism until last year. I’m 27 now. What if I am just dealing with social anxiety all this time? I feel like I can get social cues pretty well even though I’ve been told that I haven’t in the past. For example my mom came with me to a doctor appt and my doctor was apparently being rude to me and I didn’t catch it at all, my mom had told me. But that’s just only one example! I had to train myself to understand people’s intentions because I used to get taken advantage of especially by men a lot in my life. However I am wondering if I just have anxiety or if I have autism too. Like what if I fooled my psychiatrist or something and I really have anxiety. I feel like I should get another assessment done. Would you suggest getting another assessment done?