So to answer your question of how do you get over it? I have done and am doing all the things I want to do now. I went back to college, I've travelled, etc. Anything that I feel just a tinge of interest, I explore without any guilt. The more I do that, the less I feel I've been cheated.
I was in my early 30's when I left so I know it's different for others who left much older.
Rainbow_Troll- actually universities in Europe have different tuition rates for non-EU students. It's much cheaper than the States a lot of times- but it's not free. I think higher education would have made a difference for a lot of JWs here if they went to good Universities- you build a network which will be useful/exposes you to research opportunities/internships in major corporations/study abroad. The sad part is there are many here who would have gotten scholarships to go to schools so I can understand why it's a big regret.