I'm in a similar situation right now. I'm not depressed anymore but I have issues with anxiety. I'm in my early twenties and still not close to being finished at uni. I feel like you do, it's as if life is just passing by for me and I'm not living it like others do. The majority of my friends have graduated too and yet I'm still here. I've made a lot of good changes in my life recently, but the fact I'm not in class due to stupidly not going to the couple meetings I needed to (anxiety/self confidence issues made me delay until it was to late) these next few months will be difficult. I guess I'm just trying to say you're not alone in this thinking. I prefer to say I'm taking "the scenic route" through college, lol. We all progress at different paces, we are both young and eventually we'll get there.