If you cannot answer these questions now, don't worry. You will be more sure in time. You and only you know how to label yourself correctly. So, you may be ready to find out more. Start by reading.
Librarians are usually glad to help.
Please note that not all books about gay people are supportive. Try calling a gay hotline. Most major cities have one. You may want to call from a phone booth for privacy. They will let you talk about your feelings and will direct you to organizations that help gay people.