She treats me like I'm not in her presence. Shes always yelling at me for no reason. She gives more respect to my brothers than me, but only my brothers fight her while I respect her.
Attention is not equal to love and being valued. It may be precisely because your brothers demand so much more your mom's attention through fighting with her that she pays more attention to them. It is a common situation in families where the "squeaky wheel gets the grease" and the siblings or family members who don't demand as much attention end up feeling invisible. It sucks to feel invisible and it is important that there is attention for you and that you know how much your mom loves and values you. This sounds like an important conversation to have with your mom and if she is not able to really understand or help you address this concern you may want to suggest doing some family therapy where a skilled therapist can help you and your family work this out.