What if no colleges accept me?

I am a junior. In my high school, I was like one of the best students...This year, everything has turned upside down....I have a culmulative 3.6 GPA right now, I am guessing it is going to go down even more...I wanted to major in Chemical Engineering and now I found out that I just suck at Physics...I have taken two advanced cles: AP Biology and Chemistry...I don't get accepted to honor society in my school because of awfull politics in my school...I am really discouraged right now....My PSAT scores were very low: only 1410...Almost everyone in my school has a higher score than me...I can't work hard anymore...I just can't do anything because I am so frustrated about stuff....I search college requirements and I never meet them...What if I don't get into a college?? Where am I going to go?? Does that make you the most unsuccessful person standing on the earth?? Seriously...I feel like picking up my monitor and throwing it away....