I Am Asexual

I have claimed this for years when people ask me why I’ve never been romantically involved with anyone. Most times I get told to see a doctor because something MUST be wrong with me. Every year, when I get my check up, my doctor tells me I am in good health. So I am assuming it is caused from something either mental or neurological. Either way, I wish people did not question me further and just take my word for it, maybe not ask at all. Maybe I should just start lying and telling people what they want to hear.