Why do i wet myself so easily?

So i pre-come very easily. Here is a list of things that makes me pre-come. ( i secrete a clear fluid out of my penis). When someone strokes me, rubs me, when i touch pussy, when i touch boobs, when someone talks dirty to me or even if someone sexts me. Im imbarrassed that i pre-come so easily. My first oral sex lasted 15 seconds cuz my ex-gf didnt like the taste of my pre-come. How can i stop pre-coming?