I really messed up now huh..?

Ok, im going to be a senior this year but I already ruined my chance at success. My freshman and sophomore year I did great, top 5 in my class. Junior year comes around, I'm feeling cocky, smart, and laid back. BOOM. I stop doing hw, I just give up. I end up barely passing classes. My GPA went from over a 4.0 to 2.8. Now Im not going to get any scholarships and my whole family will be disappointed in me. I won't be able to afford college and now all my potential is going to waste, way to go ******* retard. (myself).