Trust and confidence issues compared to the confident guy years ago, what to do?

Im a 21 year old college stdent and I looked back onto my high school yearbook and saw how I had a jock type life, a girlfriend and friends. Now reflecting on my current day life, I'm a slightly overweight single fraternity guy who is great at giving people advice but represses all emotions and concerns to myself and I think Im reaching that point where I'm tired of playing off as the guy who has all the advice for the world except myself. Even the "frat boy" title doesnt even seem to boost my ego up and I dont know what I can do to shed some light on myself