How does a person become a great achiever?

I'm 15 and im wondering about how someone like me can achieve something like being in Varsity or getting academic credit or doing extra curricular activities or basically anything that improves my standing in school and as a person, but problem is that im lazy and i don't have a sense of motivation to do these kinds of things. Other students do it but I really can't see any benefit from doing it. Please give some advice that can shed some light into this