Not to rain on your party, or to seem like some flamer, but lol @ $14/hour at your 5th year. I would hope that someone with some minor skills going into college should be able to find a starting $10/hour job right away and then hopefully be making as close as possible to $20/hour during their fifth year at college. Sure, not everyone could maybe start with something over $10/hour, but I'm pretty sure you can leave the jobs that start lower than $10/hour for the LS&A students. Research assistants routinely start at $10/hour in the science and engineering departments, and if you get good at what you do, then you are an extremely valuable asset to whatever researcher you are working with, and they will be willing to pay top dollar (for an undergrad) for your time, help, and contributions to their research.
Otherwise, if you're having fun then keep it up. I'm sure the exercise is good, just make sure to protect your back.
Edit: Other than the benefits, if you can use them then and ultimately end up ahead of the game, then it would be well worth it.