Help?

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So I met a girl in my church a while back. We were enemies for bout 2 years and became the best of friends; My sister, her and I. Well we became real close going through ups and downs together and stuff and I realized that I had an interest in her. I found out a lot bout her and also found out she doesnt date younger guys. I'm one year younger btw.... But every time im in a rough spot, she makes me smile and is there for me... I wanna tell her I like her yet don't wanna ruin what we already have. We are all just goin through drama so kinda makes it worse... WHAT DO I DO