It is completely normal for any human to feel something for a person, and if you have felt deeply then that just means that you have a bigger heart than others. Those people who feel deeply think that there is something wrong with them; that they are too vulnerable. But the deep emotions you possess is a proof that you are capable of so much more than you could imagine.
I know that you feel bad and disappointed once a person you have feelings for don’t show any interest on you but should that let you stop from loving others? I think not. It just means that you have given the wrong person a love that is too much for him/her to handle. You should be careful on who you put your time and effort to, but never be hindered on expressing it because we are made to love and be loved by Him.