I have a stalker, or im pretty sure i do?

about a week ago i went outside of my house and there was a man sitting across the street by the lamp post, i wasn't very alarmed because i was with a friend of mine, it was about 12:30ish. But 2 days ago i took a walk to the park and i saw this man again, im afraid to look out my window because i fear that hes gonna be outside, ive seen him at least 3 times and after sundown, not sure if i wanna contact police, but i do live with my parents, what would you do?