Am i right, or is it my mind?

I know i have bi polar and all that other junk they label me with lol, I know there are many symtoms with anger issues but i dont think this is one of them........I just feel as if i get treated like dirt and my brother like gold, Im 19 hes 17, and its like this, say i were to do something and get chewed out over it, He could do the same thing and might get the word quit that with a smile.......-_- I just cant stand it anymore, I know i sound like a baby here and please forgive me for that but uts horrible anymore.......Like the other day my brother wanted a ride to his girlfriends witch is like 2 towns away, but when i wanted to go to my friends my mom said noooooo, but she will drop him off there all the time and pick him up, I hate this any ideas thanks to all who answers