I would suggest that it is way too early to focus on any one college (especially a hyper-competitive one like Stanford). You have no HS GPA and no standardized testing.
Stanford had under a 5% acceptance rate for applicants – and one can assume it is even lower for international applicants. The chances of gaining admission to Stanford are very small for any unhooked applicant.
Do your best academically, get involved in things you care about, and see how things look when you are a senior.