<human>: Can you summarize the given text in a few sentences?

Hello Redditors!

I have tons of plans for my life. I want do so many stuffs. Everytime i begin with something i'm super motivated, doing overhours, don't mind doing it repeatedly until its done, having the 'never give up mentality', etc... :)However it's apply to the first steps and than i give up because i think i can't do it.:(
_____

My bad attitude applies to *every* single part in my life you can think of but I give you an example of the most important one:
So at every semester I prepare classes in before. I do every homework. after some weeks i think i wont pass this semester anyway because its getting much harder so i dont need to focus this subject in this semester hard(i will do this in the next one) so i can focus on others more.
At the end the of semester i think '*oh the subject actually easier than i thought. lets give a try*' and i start learning for the exam.
but after some exercises i think again this is too hard because i didnt payed enough attention in the last weeks and ending with give up.
Yeah i know that i'm responsible for this failure and its get me frustated. Sometimes some miracle happens i pass (underseved).*

Now I am in a tough situation: i need to pass the 4 current exams in this semester or the next(deadline). If i can't do the exams in this semester (95% i wont) i must pass them in next semester + the exams from the new semster. so its 8 exams in total. I'm 100% sure when i dont get my mental/attitude problem fixed i won't pass them. If I can't finish a regular semester with 4 exams, how can I finish than one with 8? 
___
Its get me so frustated because the reason i fail its not because the challenge is too hard, or i lack of skill no its just because im not confident enough to do things until the end and giving up during the process.
<bot>: I could do things but because I think I can't do it i end up with doing a bit but no results in the end.