I feel so overwhelmed...

Hi guys. I'm a senior in high school now. I'm applying to 10 schools, four of which include top 20s. I'm definitely an overachiever, and I think right now that is my greatest weakness.

I'm lucky when I get 6 hours of sleep a night for school. I'm just always so tired. I try to write my supplemental essays, but my mind blanks entirely on me.

My senior year schedule includes 4 AP classes, including AP chem, and three other demanding electives. I also work a job, have many clubs, and I work for an internship of mine. I'm just scared that I will burn out before September comes around!! What should I do??