Crushiess

I have this huge crush and we are scince partners, and he knows me i now him hes sweet hot smart, (dont mind my grammar its terrible im lazy to fix it) I can bearly talk without studuring, he is popular. AND I NEED HELP. Any advice to show my crush yo myself only meaning like hot studduring, blushing, etc. I dont feel like i should or should not tell my best friend I've known her since i was 2 and im 13 now. H E L P