Intelligence doesn't automatically mean "high achievement", but a lot of people link the two things together and it can make life seem hopelessly frustrating especially when the constant disapproval is coming from your parents as well as yourself. Being more intelligent than average means you have certain advantages, but achievement wise I'm thinking that highly intelligent people aren't much different from everyone else.

I've been IQ tested too and I got a high score, but I still haven't gone to college and I haven't done a lot of things that many people feel that I "should" have done by now. I'm in my 20s as well and I don't have much to show for it. I'm never good enough for my parents either. I'm sorry you're dealing with this, I know what it's like to never be good enough no matter what you do or don't do. I think it bothers you because they are your parents, it's natural and normal to want their support and approval. It's one thing to know logically that it's likely that nothing you do will ever be good enough for them, but accepting that on an emotional level is easier said than done.