I'm a boy and I love looking at girls' clothes
Why do you enjoy looking at girls' clothes? Are you interested in wearing them?
I feel that girls are graceful.
If you prefer to look at clothing that belongs to a certain gender, then that is your preference and there is nothing wrong with having a preference. People can wear whatever clothing that they like as it does not negatively affect anyone. If you prefer clothing belonging to the opposite sex you may be genderqueer, someone who does not follow binary gender norms, and that's something totally acceptable to be.
Maybe, I do have feelings for girls
Well I think you should keep considering being comfortable with the things you like so you can be happy.