Don't take this the wrong way, but at age 19...what's so bad about being uninterested in sex?
Just think of all the unplanned pregnancies, STD's, and emotional attachments you can avoid by simply dating people to get to KNOW them...and not in a biblical sense
That said...the reason I clicked on this thread is because I think my husband may be asexual. Or possibly gay. I don't really know. All I know is that he just plain, flat out, does NOT want it, period. It's like pulling teeth to get him to do anything at all. And he won't really tell me why. I blame it on myself, my weight, maybe I'm just no good in bed. I don't know. We've been together for 7-1/2 years and it's been this way for maybe 7 years.
All I can say is, if this is really how you feel - just please, when you get to that age, and you find someone you want to date and/or marry....please just be upfront with them from the beginning. So they know that it's not them, it's not that they are unattractive or incompetent in bed...it's your own personal thing.
Asexual is a real thing, you can google and find a lot of information.
But really, at 19....I'd consider it a blessing, not a curse!!