You'll be okay, dude, but you have to make some changes. I was a virgin until I was 24, and I get the feelings you're dealing with. It sucks, and it's so isolating bc it's embarrassing to talk about and ultimately nobody else can solve it for you. Btw, I'm taller than you but not by much. I'm now having a comfortable amount of sex, and I'm sure you're going to in the future as well.
Advice: 1. Dress better. Throw your pride aside, and go shopping w/someone who knows their shit. It may be embarrassing/frustrating/expensive, but just do it. Buy the shit, keep it ironed/pressed, and don't worry what others think.
Get in shape. You don't have to be a model; half of college hookups are going to happen with the lights off anyway ffs. Just be halfway fit. Literally 50-60 pushups a day will help a ton (and work up to it if you can't do that yet).
Lower your standards. Don't worry if people judge you -- if there's someone that turns you on (even if you're ashamed of the fact that they do), go for it. Besides, how hot someone is has zero correlation with how well they can please you in bed. If you're turned on, just accept the feeling and shoot your shot. Rejections can be awkward, but I promise in a couple years nobody will even remember.
Don't be afraid to take the plunge. I know that for me, flirting came easy, but it was hard to be confident and make it clear that I wanted to fuck someone. It's okay to want sex, and it's okay to have dirty thoughts -- whoever you're with will have some too. Don't be scared -- they can always say no. Just don't be a creep about it. Being direct is rarely creepy, anyway... hinting in awkward ways is.
Learn about sex. You won't really know what you're doing the first few times, but be as prepared as you can. If you know basic anatomies, condom use, washing/grooming down there, foreplay, consent...etc, and if you pay attention, you're already better in bed than 50% of guys. I remember being stunned listening to some girls tell horror stories about guys. For some reason, tons of people don't even understand the basics.
Don't rush or force it. If you are able to meet enough people, eventually something/someone will click. You might first have someone who you make out with but don't do anything else. Maybe you go on a few dates with another girl but it doesn't lead to sex. Those are fine -- eventually, you'll find something that leads to more.
FOMO sucks, and the loneliness is even worse. You may have some bad genetic luck regarding your height, so your choices may not be as great as some 6'3" model. Guess what, though? Women aren't nearly as shallow about that as I had thought for a while. The key is CONFIDENCE. Seriously -- not faked bravado, not a 6-pack, or $$$, or anything like that. I had all these things and stayed a virgin. When I got confident, got my shit together, and got better tinder pictures, I started having more options. Good luck, and don't feel bad about being a virgin at 19. You'll be okay; I believe in you.