Evertything feels like its gonna collapse help?

My life right now is about math. I'm failing math. It sucks. Currently I have 5 math cles, 2 grad level and the rest of them hard upper divs. I also need to finish my thesis paper if I want to graduate with a B.S. in Pure Mathematics. I feel very stressed. Not only that but in my day job I tutor kids who don't like math. My mind feels like it can only take so much sh*t. I have made very little progress towards my senior thesis and what's upsetting most of all is that I received two Ds in my homework for Abstract Alg II and Topology and an F on a midterm in Advanced Number Theory seminar. I feel like I want to jump off a bridge litterally. My life is a failure! I remembered in high school I did so well in math. I aced the AP Calculus cl with a 5, the SAT Math Level 2 with a near perfect. I'm just not feeling it in my last year of college. I can't help but think that maybe I'm just not bright in math. Should I quit? I feel overburdened.