I used to be in similar situation to you a long time ago. What I'm gonna tell is what I learned through my experiences, hopefully you can find some advice through it.
First off I'm sorry you're feeling this way. I know it's not easy to deal with this feeling all the time.
However I would recommend not to overthink the first part. I have many friends who are relatively "rude" and also say mean stuff. However for some people that is genuinely their personality, and they have trouble balancing it out. Best thing you could do for yourself is
- let them know you feel this way
- not be friends with them
- change your outlook
I would recommend the first option personally. If they're really your friend they'd be understanding towards this.
As for your imperative of being "ugly and annoying", I'm assuming it's off a front of insecurity and trouble fitting in.
I'm a senior who's gonna graduate this year. Never have I properly fit in. Many times I was ignored or pushed aside, but it's because I wasn't superficial.
See you're between 13-14 so I'm assuming your in middle school and early high school. Relationships at this age are shallow, and are not strong. (Relationships aren't just about how long you've been friends, but about the challenges and work-arounds you've gotten past together)
So my main advice, change your outlook, and put yourself out there. It's ok to feel conscious at first, but as time passes it will disappear. But you'll find better people as you try. They're are going to be people who dislike you, or are rude to you (empathy comes with age). And that's ok. Search for people who are gonna make you feel valued and who will keep you in check as well. ๐