I'm with Lenny. Interests and drives rise and fall with time and circumstances. Are you on any medication? Psychotropic drugs have a huge effect on sex drive. Are you a teenager? Do you feel you have to be like a stereotypical hormonal teenager? The trouble with defining yourself as 'asexual' or 'gay' or 'purple' is that lables can be so limiting and constrictin, especially at a young age. You don't have to be anything. Focus on being a good friend. If the right friend turns into something more, see where that goes.