College is hard. There's no way to sugar coat it. While taking 15 (or more) credits there's hours of reading and studying, plus you have to have a job in order to pay rent and for food. If you want your resume to stand out you need to have extra curriculars, so you have to make time for that on top of everything else. Don't forget about your social life though, and your long distance friends, or boyfriend. Plus it's college-you want to have some fun.
It's a lot. I'll be the first to admit that sometimes I do too many thing. Or it seems like I'm barely doing anything, yet I have no time to breathe. I think the latter is worst. It seems like you're so under involved but you find it hard to remember to eat.
I guess all we can do to get through is remember that I won't always be like this, and there's nothing wrong with taking out a few loans or lessening your burden by quitting a few activities or taking less hours at work. Remember to take the time to breathe and calm down. Plan out times to do things and makes lists. Staying organized helps reduce stress and makes it seems like you actually can get it all done, becuase guess what? You can do it! You're gonna graduate and pay your bills, you're gonna get that project done and you're gonna make it through that 8 hour shift. It's okay to be overwhelmed, but you won't be like this forever.