Why not try both? I'm also an engineering student, working my ass off in my vacations to earn some money (not forgetting to enjoy life, travelling, going out), to get some flying licences in the future.
If I only could combine flying and engineering, it would be the best thing ever. But for now I only concentrate on getting the degree and afterwards, while working start training for the PPL and who knows what might follow later on.
Enjoying your time while studying is one of the things I forgot during the first 2 years as a student. I did not travel, did not go out that much, only studied and worked to save money to fly. The most important thing to me now is that I enjoy what I do. I don't spoil my money, but I won't say no to a trip to southern France with mates! Don't forget this!