it was rape; you were a little kid, you were taking advantage of and sexually violated.
Statutory Rape, yes.
Saying yes to begin with doesn't mean it's consentual - if you at any time during the intercourse said no and was forced to go through with it, then it was rape.
Yes it was as you were to young to give your consent.
It is rape. You were too young to understand, like you even said. If you're too young to understand then you're too young to be able to say yes.
Not to mention the fact that you are underage and your consent can't be taken literal.