His friends probably rejected you out of a sense of loyalty to him and not because they found you annoying or boring. They don't sound like nice people and nor does the guy you went with afterwards. You have 2 close female friends in first year and that's an achievement; many people never achieve that an uni.
Getting over embarrassment can be difficult, but everyone embarrasses themselves and your case isn't that bad in the grand scheme of things. You shouldn't feel ashamed, as he treated you like a piece of crap and then his friends followed suit. You deserve to find people who will treat you with respect and there are plenty of good people out there. As others have said, you are at uni to get a degree - you are the most important thing in all of this, so put yourself first. You are worthy and you can can get over this.