Is it normal to not have any dreams/aspirations?

I have a lot to be happy for, I have a loving family, a wonderful girlfriend that I can confide in, nieces and nephews that are wonderful, I'm studying at an incredibly rigorous and reputable school and have done moderately well, and my family is very encouraging and praises my talents.

I'll have a dual degree in math and computer science (bachelor's) this coming year, but there is nothing I want to do in life. I'm not interested in any careers (possible ones and not). I don't want to teach. I don't feel like going to grad school. I don't have any hobbies that I care much for. I don't have any answer to the question 'If you could spend your time doing anything you want, what would you do?'. I don't want to do nothing, but I've tried several hobbies, volunteering, and nothing. I can't find anything that I 'want' to do. I don't even want to do nothing and sit around, but that's what I feel like I'll end up doing. Do people feel like this after college? Is it normal for the world that is supposedly bursting open with possibilities upon graduating to seem suffocating, now that it's no longer clear what I'm 'supposed to be doing' (i.e. graduating high school, finish college)?