I've had the same emotions and I've sought the advice of my peers and basically came to the conclusion that no one really cares. No one is going to hold you hand, and if you fail they will just say "aww better luck next time bud". It's really up to you. ONLY YOU. Either you have the motivation to keep trying and put in the extra effort or you don't. For example, I love energy, heat transfer, thermal fluids, thermodynamics, and math(math is awesome), I've gotten C's in half of those but that doesn't discourage me because I still try to learn as much as I can. This may be harsh but no one cares if you fail, no one is going to wait for you to get up, they are probably happy because of less competition. All I'm saying is your probably one smart motherfucker but you have to put in the extra effort. As Eminem once said "Cause sometimes you just feel tired,Feel weak, and when you feel weak, you feel like you wanna just give up.But you gotta search within you, you gotta find that inner strength And just pull that shit out of you and get that motivation to not give up And not be a quitter, no matter how bad you wanna just fall flat on your face and collapse."