Should i work at UPS during college?

NO NEED TO READ ALL! :D

I am 19 going on 20 years young and just finished my freshman year of college. This first year i sort of had the "college experience" mild partying, meeting new people, sex of course etc. And i actually enjoyed it even though i could have a lot more fun.

This summer i'm currently working at UPS to gain money to buy a car. My plan is to work and get a car then quit and find a job on campus. why would i quit? reason being is that its 5 days a week 5-10 or later every night. I'm obligated to do at least 15 credit hours per semester to stay with my scholarship. I honestly do not want to spend my whole college life doing nothing but school and work and school and work. I understand money is a necessity in this word but you're only young once. I rather find a job that has me work maybe... 2-3 days a week with decent pay.

now the benefits of the job is $10 starting pay, health benefits if i work there for a year, a $15,000 reimbursement if i work there for a whole semester and i think that's about it. These are all wonderful benefits but i hear UPS takes a huge toll over your body over a certain amount of time. I honestly do not think sacrificing my freedom and youth is worth a stressed out body from work and mind from school.

Honestly if i was the type of person who had the willpower and focused only on school and work i would do it but i would like to live a little meet people and have fun.

am i making the right choice?