Liking my brothers friend

Adriana

So my brother has this friend and he came over for a couple days and the day before he left to go back home I realized that I liked him. He’s three years older than me which isn’t bad (I’m 16 and he’s 19) I don’t know what to do. Should I tell him what I think about him even though he might not like me back? Or should I keep it to myself?