Why are my guy friends so protective over me, if they think I'm ugly??

So when I ask my guy friends if they find me attractive they usually say no way, they think I look ugly as hell, like a monster.

So in my group of friends I'm the one that's always single and my guy friends make fun of me a lot because of it.

One time all my group of friends went out, I found a very hot guy I was alone with him and I was trying to flirt and talk to him, and all of sudden my guy friends grab me against my will and asked me if the guy was bothering me, I got really upset because the guy left. They always do stuff like that even when they know I'm clearly not in dangerous it annoys me because it scares the guys I like off, one time I was checking out a guy in the club we were making eye contact has soon as one of my friend realized this he just grabs me and pretends he is my boyfriend.

I told them to stop multiple times but they just keep doing this.

My question is if they think I'm ugly and that I need a boyfriend why do they protect me so much

p.s They only do this with me
Why are my guy friends so protective over me, if they think I'm ugly??
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