I wish I could offer words of encouragement and tell you it would be worth sticking it out. But if you are going into debt for an SM degree and you aren't 100% sure of that choice, then it might be time to reconsider. Unfortunately, the people you work with will not get any better. Every company has some good, hard-working performers who will make you love your job, but just as often you will find yourself babysitting rude, immature, and unprofessional "professionals". Not everyone will have a strong work ethic and if those people are dragging you down now it is unlikely you will find happiness working with them in the professional world.
You are in Seattle. There are some very wonderful, large companies there, like 5th Avenue. My best advice is to get out of your school for a bit and work somewhere else. You need an internship, either in Seattle during the semester, or perhaps somewhere across the country during the summer. If you can take a semester off to do an internship that would be even better. What you need is some outside perspective. See if it is just tension from longevity in one place or a condition that will appear anywhere you end up. It could just be the sophmore slump from working with the same people for a long time. But if it is a more serious frustration it is better to learn now and find a solution than go further into debt for a degree you do not find valuable.
Also know, if you do decide to finish the degree, there is no law that says you have to continue working as a stage manager. Plenty of people with degrees in stage management have well paid positions in other career fields. Our skills are highly transferable, so please do not feel trapped by an SM degree. In general, I always advise students to do their best to avoid going into debt for any degree. If it is possible to get a part-time gig to help keep the debt paid down or avoid taking out more loans you would be in much better shape. Starbucks and some retail store are usually very flexible with students and understanding of scheduling difficulties. But I'm sure you have heard all that before. I don't mean to lecture, but I've had good friends who are drowning in debt payments from their theater degree because they took all the max loans out and didn't build up a savings account while in school. As hard as maintaining freelance jobs or a part-time non-theater job may seem, the result I found was highly worth the long hours.
You might start with the "internships" tab at the top of the SMNetwork.org webpage. That might give you an idea of the types of places you could apply. A google search and some local research should also yield some good results. Best of luck and I hope you find an answer. :-)