How to gain weight for 15 year old male?

I'm 15- sophomore in high school & 5'5 tall and 122.5 lbs .. My Dad is fat but geneticlly he's skinny like me usually. I Run Track & Work Out & iEat Like Godzilla. How Do I Gain Weight and bulk up without being fat & blubbery . I've gained like 2.5 lbs in the last 10months