Stage Management Colleges

I am a senior in high school, and I've been doing musical theater shows for about 9 years now. I love being on stage, and i love being backstage as well. At this point, I don't think I'm good enough to get into a musical theater program in college, however, i don't want to give up theater. I would be a great stage manager, but to get into a good college, you need a strong portfolio. I've only been stage manager once, and assistant stage manager twice. I've worked lights, special effects, assistant directed, but how (or should) I put that in a portfolio for college? And if so, can you give me some college names that would be good for me? Thank you!