Hi man, yes I've got a few things for you, based on my 41 years of experiences.
First, if a girl really likes you, don't shun her. Give her a chance. Someone who genuinely finds you attractive is someone who is much easier to have a meaningful relationship with, and you never know, you can grow to be very fond of her too, even if you aren't real attracted to her in the beginning. When I was younger, I usually found myself falling for girls who did not reciprocate the feeling, and I sometimes shunned the girls who like me, simply because I was interested in someone else. As I matured and got older, I realized that was really stupid. After years of failed relationships and relationships that are less than satisfying, I find Myself thinking that I should have given those girls a chance, the ones who genuinely appreciated me and who obviously liked me.
Regarding the "ugly" thing, here's what I gotta say: first of all, you can greatly improve your attractiveness by taking care of your appearance - the way you dress and groom yourself. This goes far. Secondly, the whole "attractive"/"pretty" thing really doesn't matter. What matters is chemistry. And no matter who you are, there are always girls who will feel a chemistry with you. This is obvious from your own descriptions of your experiences making out with club girls.
Approaching girls is definitely hard. My advice is to simply be who you are. Don't try being someone you're not. If you're nervous or shy, don't try to hide it. Just make yourself go up and introduce yourself. You don't have to try to "make them laugh" or "be on your game" or any of that crap. Just be yourself. This is truly the best advice, because it means that eventually when you meet a girl who likes you, you will know that she likes you *for yourself*.
I know. It's really hard. And it doesn't get much easier. I mean, even nowadays, I sometimes get butterflies if I'm in the presence of someone who I am really attracted to. But just keep doing it, because eventually you will go up to a girl and she will really dig you, and you will find yourself quickly warming up to her and it will be very comfortable.
As far as "making out" ... you know, there's nothing wrong with "make-out practice." So next time a girl at a bar tells you she wants to make out, you might just consider it "practice" and go for it.