Diagnosis and resentment

I have recently be diagnosed with Autism at 30, whilst part of me is happy about this. I also hold a bit of resentment towards my parents for not doing this when I was younger. 

When I have spoken to them about it, they both say that they thought that I was when I a child but they didn't do anything. 

All I can think of is how my life may have been so much different. 

How do I process my recent diagnosis as well as my resentment towards my parents.