You should sacrifice the present for the future. That's how you become successful. Focus on getting your shit together. Do some side projects because you are interested in doing them, not to get good co-ops. Study the material to get more competent for your career, not to pass your exams. Be friends with people who want the best for you.

Also keep in mind that it's not about "not suffering", it's about "bearing your suffering". There are a lots of reasons for everyone to be resentful and there will always be. It's about reducing it and the way you do that is putting yourself together. You know how you that, the question is how much do you want to do that.