Self esteem advice

I’ve been really struggling with my self esteem for ages, I’ve been undiagnosed with autism for 19 years. My recent diagnosis makes sense and helps me understand but I still have low self esteem especially in meltdowns. I get frustrated at myself a lot and don’t like how I feel and sometimes feel like my meltdowns wasting my time. I also feel like  bother other people if I’m out with them and suppose to do something but end up having a meltdown and get frustrated at how I feel like my autistic traits limits me compared to neurotypical people. I really want to start liking myself and accepting this any advice would be appreciated Purple heart