Yeast infection???

How can I, a college student, get rid of and stop a yeast infection? I wasn't sure if this was what it was at first because I try to make sure I practice good hygiene, but as I read, articles said that using Vaseline or baby oil down there is a big no-no and can cause a yeast infection to build. I didn't know that and I use Vaseline down there every time I shower or shave. I'm a college student and athlete so I don't have the patients to deal with this. ( for those who are wondering, no I've never put Vaseline or baby oil inside of my body, but around the shaven parts). Please help.