You need to figure a way out to do well in your P and C exams as well; simply because even in your future career (full time job, freelancer, startup) there will always be elements that will suck. You could also use this as a test parameter: if you don't give up when the sucky parts strike, that career option could be one for the long haul.
>> I really regret that I wasted so much time
No point regretting, be careful to not make that a habit. Just figure out why you couldn't do well even on the second chance; fix those. And losing a year or two in life is a normal occurrence; every few years we will lose a year or two but if you put in the effort to learn from those they may actually be the pivotal years of your career.
If you think having someone to guide you offline can help; my email is in my profile.