I can`t be open with the people i admire much, i seem to be unable to be natural around them, especially the opposite sex.is it bad or normal?

Normal: We all have our fears and most common is with people we like, as we also like to be liked so we don't want to make any mistakes. Try to have more confidence, and be yourself, be natural. You want to be liked as you are, not as they want you to be. Remember, when they get to know you, you want the you to be the one they like.

Self esteem: I am not a psychologist but would offer my view since you have been waiting for awhile. It is understandable that you feel anxious when you want someone whom you deem admirable or desirable to like you. I think the best way is to act naturally especially with an attractive male who will like or dislike you for what you are. Any relationship based on pretense is not going to work anyway.