Switched majors half a dozen times, got denied from every internship/program I applied to. I have no idea what I'm doing. What next?

Hey ya'll,

So I'm a college junior. Good grades, solid university, try my hardest, am fairly evolved, etc. I've always loved academics and school, and so I heavily enjoy my time here. I have a good social life, I have a part time job, supporting people in my life. But I cannot for the life of me decide on a career path, and the more I think about it the more depressed I get.

I switched majors several times and each time I'm never totally sure. I'm studying international relations right now, and although I love it there's not exactly a career field for me. I figured this summer I'd get some experience, meet some people and help make a decision - but I've gotten zero acceptances to releated internships and programs. I have no idea how to spend my time, beyond working at my job. And maybe taking courses.

The more I think about my future the more envious I am of people in fields like STEM. Learn a skill, learn cool things, get a great, stable, high paying job. Meanwhile I feel like I'm struggling to even pick a field. The job prospects suck, and even if I get one I'm working with people that are too opinionated and think they're too smart. I love hearing about all the awesome developments the tech world makes, or my engineering/nursing friends do, but I can never do something that interesting. Instead I'm learning about theoretically political relationships...which, I like, but again I feel like i'm not LEARNING anything that I can actually use. I feel horrible about my choices all the time, I feel worthless regularly. I've taken every career or major test out there, I've met with advisers and professors asking for advice, and I cannot make a decision. I am running out of steam and am constantly worried about my life. Nothing I do feels worthwhile and I think my skills just aren't in the right areas. At this point, I'm afraid I've exhausted every option. Considering more schooling after my undergrad...but even that...no idea what I would do. Law school? The stuff I read about lawyers makes the idea seem so depressing and dejecting, even if I really like the idea. Oh well.

Sorry for the long text. Just feeling very exhausted and stressed.