Is it normal for veins to pop out on my legs?

I'm 14 and i'm indeed a male and highly athletic. I play baseball and soccer for my middle school and I plan on playing for my high school as well. I exercise very often and sometimes I have been asked if I have been using steroids. Veins have been popping out my arms for three years. Just recently, veins have been popping out of my legs.. Is that normal?