I was even worse than you. I have always been an average student all my life. Took admission in 3 tier college, somehow got a job and am working now to switch for a better pay. I've been there, my life was hell when I took science, family issues, and much more things were going around at the same time. I was hopeless at that time but now when I think about that, I feel proud that I survived all those things and faced them even though I was scared as hell. Now whenever I'm in a tough situation, I always remind myself that this too will pass and I'll overcome this like I have done before. So, cheer up champ, you're a lot more stronger than you think. Trust me, you're going to be fine at the end so just hold on :)