My opinion may be un-popular here, but here it goes.
1) Like you, I have anxiety (general anxiety, social anxiety, depression). I had really really bad panic attacks when I went to college to the point where I would need to leave class for a bit because I felt like passing out. I would sit in the desks by the door and just wait for the time that I would need to leave. College was hell, but I went because, well, I was forced to by family.
2) If you don't know what you want to study, then drop out for now, and focus on working at Target, if that's REALLY what you want to do. If I had it to do all over again, I would've just went to community college. Instead I got a useless Bachelors degree in Humanities that I can't do anything with. Why Humanities? Well, I didn't know what I wanted to study, or what I wanted to do as a career after school, so I just took classes that I enjoyed (mythology, theater history, art history, etc., etc.) I switched majors several times, but still couldn't figure out what I wanted to do. My four years were up soon, and I had to pick something to graduate. I had already taken a lot of classes for the Humanities degree, so I went with that. I graduated college, and guess what??? Ended up working at a grocery store bagging groceries. Nice huh?
3) Again, I say, if you don't know what you want to study, if you can't figure out why you need to be in school, skip it for now. Work at Target, you seem to love that, and figure out your interests. Have any hobbies you love? Can those be changed into careers? Try getting a degree in something that interests you, not just because something is a safe career. Sure, medical careers may be wonderful, but if you hate doing it, how is YOUR health going to be? You may worsen your anxiety, or develop some kind of deep depression if you work in a field that you don't enjoy. If you REALLY love retail and see yourself in retail forever, that's great! You probably would be better off at a Community College or Technical College getting a business degree, or retail management degree, or something like that.
4) If you move up the ladder at Target and you're feeling like "man this sucks, I need a change," THAT'S when you need to figure out what you're really passionate about. You can always go to school part-time while you're working, if you're motivated enough to leave Target. Also, since you struggle with anxiety like me, I would suggest looking into online classes. More and more colleges offer this option, and that would be a great way to fit school into your schedule.
5) You don't NEED to go to school now. School will always be an option. Just don't waste your money (especially if you are getting loans) on something that you DON'T WANT to do. Spend your money on something that you love or see yourself working in for a long time. Even if college is free for you, don't waste your time on something you won't like.
As someone with anxiety, I can tell you that if you continue school in a field that you don't like, and if you feel like college isn't for you, then you need to just take a break on it, and focus on what you're enjoying right now. If you stay in school, you'll just feel pressured to complete a degree, and you could end up hurting your anxiety, and possibly turning it into Panic Attacks like what happened to me. Not saying it WILL happen, only that it could...
My story: Went to college, had NO idea what I wanted to do with my life. Graduated with a useless Humanities degree. Worked in grocery for a year. Moved to a big city and found some office work through a temp agency. Still trying to figure out what I wanted to do. Took some classes at the community college in Accounting (sounded fun at the time), didn't enjoy that. Took some classes in Paralegal at the community college since I worked at a law firm, didn't really enjoy that either. Couldn't see myself becoming a Paralegal either. Still working at the law firm, became really interested in law enforcement (I always loved doing police ride-alongs, watching 'Cops', following police scanners on twitter, attending police citizens academies). I just really fell in love with law enforcement, and finally a light bulb went off. THAT'S what I want to do, work at a police station in some position, I didn't even care if it was records, or dispatch, or admin support, or whatever! So, I went back to community college and took classes in Criminal Justice and absolutely enjoyed school so much. Had no anxiety issues, or panic attacks at all, even with having to do a few presentations. I looked forward to classes. I'm still on my way to finishing my degree and applying to work at police/sheriff departments around my area. And here I am, at 39 years old. I finally figured out what I wanted to do with my life. I finally found something that I was passionate about.
Don't just skip school and never go back. But, if you feel like it's not for you, take a break. Work at Target, save money, pursue some hobbies, figure out your interests. Just take some time to figure yourself out. Then, when you find things you love and are good at, then go back to school and educate yourself, get your degree, and get yourself in a good position to find something you enjoy doing, even if that happens to be retail.
Good luck to you!