should i propose or not help me ??????

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Well i am in love with a girl for now 3 years, we study in the same class. i love her very much but don't have the courage to even talk to her. but i fear if i let her go then i wont be able to see her for all my life. Well she does look at me sometime but i don't know if its love and if i propose and she rejects then i will have very bad reputation among girls and all my friends and i think i wont be able to go and even talk to them after that. PLEASE HELP ME I AM SO CONFUSED...