In most cases you'll see it in the forms "gusta" or "gustan". The form "gusto" would mean "(someone) likes me". The form "gustas" would mean "(someone) likes you".
"Gustar" is not reflexive. "Me gusto" means "I like myself", which usually doesn't make sense.
For example:
Tú me gustas mucho pero... ¿Yo te gusto?
I really like you but... Do you like me?