Is it normal that i cannot motivate myself to do anything to succeed?

I'm almost 22 years old, I have been in college 4 years, all of my peers are graduating in May. I'm not even close. Ever since I started college, I have been literally unmotivated to do school, totally apathetic. It's a vicious cycle. I grew up with a single mom, I worked since I was 15, even working almost full time while in high school to help support us. I was a really good student in high school, got high on the ACT, so this doesn't have anything to do with school being too hard. In college, I've failed so many classes due to just not going. I'll wake up, and be totally apathetic about it. I'll get on the internet. This has happened every semester... and every semester I say it will be different, and I'll start off doing well, and then I will quickly decline once more. I'll feel disgusted at myself, but then I feel no push for myself to help myself. It's a vicious cycle because since my GPA is so shitty, I just think "well even if I do well on this it will barely make a difference, so I might as well do something else." This semester I went to the psychiatrist and was put on meds for depression, which did help but not enough I feel. I don't know what to do. My psychiatrist gave me an email to some lady at the university that can erase grades due to health problems... but I'm scared to email her. I'm scared I won't be able to start over. I'm starting to panic inside, because if I fail out of school I will be completely screwed, I have no family. I just think my subconscious is tired of working, since I've always worked since the day I turned 15, so I think I feel like I should already have a real job. If I fail out of school, my two options are literally: 1. Go do porn. (haha, but seriously) or 2. Kill myself (not considering this an option at this point). My boyfriend tries to encourage me, and it makes me feel really good inside, but I can't do anything. I feel weird explaining it, but I don't know how else to say it besides I can't do anything... saying I won't do anything doesn't seem right because I don't really even feel an option because of 0 motivation. I just keep sinking deeper and deeper and I can't think of a way out, and I can't help myself out. I'm so disappointed in myself, but I'm too scared to even try to do anything. I always want to sleep, and I spend all of my money to try to help myself feel better. I don't really know what I want out of posting this, but has anyone else done this? For 4 years especially? What should I do? What's wrong with me? Why do I feel so hopeless?