Lazysmurf - if you are happy with your life and do not find it disruptive to keep it private from you parents, then carry on as you are.
But, you say you want to tell them, and so bite the bullet and I am sure they will understand and love you just as they did before - remember though , we have no knowledge at all of your parent's temperaments.
Folk often struggle to see what attracts people to certain hobbies and followings, but life and interests are diverse - those with the largest collections of Barbie for example are male.