Why am I still getting acne breakouts?

I'm just about to turn 24 and I still keep getting breakouts around my jaw and cheeks. I shave routinely in those areas because my facial hair grows in patchy. I've been told though, that I could be getting infected hair folicules and that they just look like zits or clogged pores, but I'm just wondering if there's anything I can do? I don't want to have to see a dermotologist because I'm broke. Should I change my diet? Should I get some sun when it's nice out?