I'm mad at my parents for not getting me circumcised
Why would you want to be circumcised?
I want to feel more comfortable during sex with my future spouse
Parents make decisions when they are raising you that you might not agree to when you are an adult, but it cannot be changed. It is better to talk to them about how you feel and work things out so your relationship improves.
I know that shit, but I don't know how to work it out with them.
I don't think sex is going to be uncomfortable regardless if you're circumcised or not. I think you are worrying about nothing.