YES! It is completely NORMAL that you feel that way, and you are certainly allowed to feel any way you feel!
From a "parent's" perspective I can see how your parents are all engulfed in your brother's business right now. It's HUGE deal for parents when their kid goes off to college, and probably even more so since he will be so far away. They are PROUD of him and should be. Right now, with time for his leaving coming so close they probably feel like they should spend as much time as they can with him, and make sure everything is in order.
Your time will come and then it will be all about YOU. I'm sure they don't mean to make you feel they are taking you for granted. We parents love all our kids equally..REALLY WE DO!!! But there are times when one kid needs more of our time than another. It's just life ya know? As for the $$$ spent on him..we do all we can for each of you, depending on who needs what at any given time. We want to see each of you succeed and be all you can be, and do what we can to see that that happens.
Once he's off to college you'll probably end up getting more attention than you want from them!!
In the meantime, hang in there. Life will go back to normal before you know it
And you will be back to thinking "I wish they would just LEAVE ME ALONE geeesh!" lol
But yes, what you are feeling is normal..chalk it up to sibling rivalry and maybe a wee bit of jealousy?? Again...such is life with siblings. Ain't they great??? LOL