Welcome! Take a look through the FTM board - lots of great resources there for people just starting to transition.
Oftentimes it takes parents a while to come around to things. They think they've raised one person, and all of a sudden you're telling them that you're not that person. Some take it better than others, but there are bound to be lots of questions, confusion, and some discomfort as they get used to the change.
Stick around and do some reading. Many, many people have shared their experiences with their folks here. You might find something that helps you.