Welcome to Susan's Place. The fact you found this web site and you dressed in you mom's clothes indicates you are transgender. Exactly what this means to you will be something you discover explore your feelings. I underwent sexual reassignment surgery but there are other options and you will be the one who determines what is right for you. If you go to youtube and request "The transition channel", the series will help you explore your feelings and may answer some of your questions while posing more.
Really it boils down to what you feel inside. Both women and men do sports, singing, acting and shopping but males don't want to become women has they are happy as men. It is also possible that you don't feel like a woman on the inside but still enjoy woman's clothes in which case you would be a cross dresser. When you can answer these questions, you will have your answer. Feel free to ask any more questions, but it's my bed time and I will reply tomorrow.