Thanks for reaching out...it really sounds like these girls are proving how immature and rude they are. It stinks that you have people like that around you, but please remember that just because they say things it does not mean they are true. What it does mean is that these girls are acting really immature and sketchy.
Their comments reflect poorly on them, not you. We know it doesn't take away the sting of their words, but you can really keep your head held high knowing that you're above acting that way. It shows what a strong, mature girl you are...and that's really, really awesome to us!
You are important, just like everybody else...you don't deserve to have these girls saying those things to you. Honestly, the best way to get bullying to end is by reaching out to caring, trusted adults. Otherwise, the girls will have no incentive to stop and no threat of consequence for their actions. If these girls are bullying you this severely it probably means that they are immature- definitely not the quality of an intelligent, reasonable person like you. Remember, you are important...you deserve the help to get this to end.
Opening up to a parent, teacher, principal, coach, band instructor, or any other adult who you know and trust would be such a great step to take. Bullying is really messed up and most schools have anti-bullying policies, there is probably a procedure in place to get the bullying under control. Talk with a teacher or the school counselor and find out the details of your school's anti-bullying policy. That would be a great step to take.
Keep hanging in there. Remember, there isn't anything wrong with reaching out for help because you deserve to have these girls stop treating you like this. You're important, please don't forget that.