Never been in a relationship, how do I come across?

Maybe you are not doing anything wrong. It is not guaranteed that you will have a relationship if you are not doing anything wrong. Keeping this in mind, you can increase your chances by meeting people that are sharing your hobbies. Guess what will help you the most? Yep, the internet. Check out the websites where you can meet people with similar hobbies and interests, and you will definitely "increase your chances" for finding the right guy for you.

We can certainly give you some advice. But it is very difficult and vague since we know nothing about you except that you are 20 years old.
What is your overall appearance? Your personality? Things about you that we should know? Types of guys you are attracted to.? These things will help

Like some of the others have said, you're not necessarily doing anything wrong. Our society makes us feel like if we're not moving through relationships, partners, etc. , hooking up, dating, flirting, partying, we're doing something wrong. Stay true to yourself. If you WANT to have a relationship, move at your own speed. Don't be so worried about how you come across, but more about being yourself!

If you want some "actual" advice. Don't pander to the guys who are willing to take advantage just because you want a relationship. In other words, take time to invest in someone, in getting to know them as a person, maybe someone who starts out as a friend. The world doesn't need another " bar skank" just looking for a quick fix ;-)

*good luck*

If you try too hard it'll never happen. I'm pretty much in the same boat but as soon as I came to accept the fact I'm single and don't care the boys flocked. Just keep meeting new people, not necessarily as potential boyfriends, but just as friends and see where it goes from there. Have fun!