Having weathered an eating disorder, Brittany Snow has shelved her personal trainer and sworn off dieting.

"Done with the trainer. I canceled my trainer," Snow, 22, told PEOPLE over the weekend at Stride Gum's Longest Day of the Year party in West Hollywood.

"I refuse to do the whole diet, fitness, style thing anymore," Snow says. "I just kind of go and have fun. I know what I like, I know what makes me feel good, and that's just what I do."

Asked how she's staying healthy, the Prom Night star says, "I think more than anything, the thing I've learned in being here is that everything else doesn't matter as long as you're taking care of yourself and you're having fun. Just hanging out with my friends and trying to take care of myself, I think that's the biggest thing."

Snow adds, "I go to the gym everyday, I eat really well, I buy dresses by myself. I want to work and be with my friends. That's all I really care about."

Snow told PEOPLE in 2007 that she had been diagnosed with anorexia, exercise bulimia, depression, and body dysmorphic disorder as a teenager – and had dipped to 85 pounds at one point.

The former American Dreams TV star has reportedly credited friend Sophia Bush for helping to coach her on body image issues.