What should I do?Please give me some suggestions

In my opinion,if that one you love is your closed friend,then pls keep the distance right now and then contact with her more and more.But if that one is not familiar with you,then you should know more about her and make her impressed on you.If you tell her abruptly,maybe you will scare her.

If she doesn't know that you have an interest in her, and you don't know her heart to know what she thinks about you, then you are not in love. You are infatuated with this lovely lady. There is nothing wrong with that, but that is what it is. Infatuation makes your heart flutter, makes you not be able to sleep, and makes you think about the person - the way they talk, the way they brush their hair from their face, the way they carry themselves and you think about them a lot. And you also may find yourself thinking about what its like to be together. I probably would try to get to know her a little better. This way, she can get to know you, too. No one can be interested in someone they don't know enough about. If the two of you get to know eachother, and the feeling is mutual - then you will fall in love unless you find out that she is not all you thought or vice versa. (then of course regular old love is different than "falling for someone too") I have been on both sides of the situation. I have been someone who liked someone else, and I have been liked by someone I had no idea about. Unfortunately, the person I liked, didn't return my feelings because really the feelings were all in my head and the idea of us together was all in my mind. I was so nervous around them that I just didn't make an impression on him at all.

definitely tell her. if you are really in love with her tell her. you never know, she may have feelings for you as well and if you never tell her you may never know and you may be missing out on a wonderful and ever-lasting wonderful relationship! and if you get turned down, at least you won't be left wondering in 20years what could've been if you would've told her how you feel.