What kind of training or college education is needed to become a lifeguard?

No you do not. You need to get certified in CPR/AED for the professional rescuer/lifeguard as well as First aid for the professional rescuer/lifeguard. Every job requires different requirements and to get the best answer you would need to contact the place you intend to work at.

I am still in high school and I am working as a lifeguard.