First of all Darkness, congrats on making so much progress. You ARE moving forward and it's actually normal to worry about failing, but if you allow yourself to get sucked into constantly worrying you will tire out just from that alone. Don't listen to the doubtful inner voices, instead keep allowing yourself to keep trying because we all only learn by doing and you ARE doing and in that you are gradually learning.

Also, if you do struggle with some subjects look into finding a tutor that can help you, sometimes you can find a tutor for free or very reasonable, you can even ask your teachers. Don't be afraid to ask your teachers for help as often teachers knowing a student is really trying will be kinder with the grading and may know of someone that can tutor you.

My older brother really struggled and was even homeless for a bit while going to college, and he often went hungry but stuck it out and searched for help and ended up graduating with honors which was a HUGE deal for him. He had teachers growing up that told him he should give up school and never amount to anything. He was determined to prove them wrong and he did, he also ended up making over 4 times what these teachers earned.

Give yourself a chance, remember no one is perfect and allow yourself to keep trying.