Ah - that kind of anxiety. I deal with something similar, but without the relationship.
I think she gave you her response - it's not you. You mentioned that she has anxiety, too, so that tells me she has her own issues. It's a tricky area having this kind of issue because if one of your grows in one direction, the other may have a weird reaction. It's hard to explain in words. :) People do grow apart and if the relationship isn't constructed to handle it...then it may not be the right thing.
You will find someone - even I have hope and I am probably older than you. The key is turn the anxiety into motivation for improvement to things YOU want. Become more confident in who you are.
You worked more to earn money and you explained yourself.