Bad age difference!!

Hey girls. I dont really like mentioning this because it sounds really bad but i have to get it off my chest. Im 16 and recently ive been talking to this guy and he's really sweet, caring and he is goregous!! My friends brother is really good mates with him and he says he is good guy. I honestly think he is a good guy too. He has opened up to me about some personal things which i find is really cute because that seems as if he trusts me. I think i am actually starting to have feelings for him. The only bad thing is...he is 21!!!