What should I do? My brother gets away with alot of stuff. I'm having family issues. Advice is needed?

I don't mean to complain or be selfish, but I really need some outside opinion. When I was younger I was always afraid that I was taking away my parents' spotlight away from my brother who is five years older than me. I got better grades than him, I never got in trouble, I always tried to help. My brother on the other hand got okay grades, I remember getting into fights with my parents and hurting my moms feelings, and at the age of 16 he got into some very bad trouble with drugs that cost our family ALOT of money in the long run. He seems to only think about himself, and when he was 16 I was just 11. He would drive me home from school with strangers in his car, and when we would get home he would tell me straight away to "go upstairs" while his friends hung out down stairs and on some occasions smoked marijuana. It always hurt me alot and I always resented him for stressing my parents out, and spending all this money. On his 16th birthday he had gotten a limousine and a new car. I'm going to be turning 16 next year and my regrettably told me that we wouldn't be able to do much for it. So of course I'm jealous! My mother's friends have even told my mom that alot of people really like me, that I'm bright and cheerful, and I'm too sweet to really stand up for myself at times, and that she needs to do something about my brother. He's about to turn 21 now and he got over his drug "Situation" at 17, he still only wants to spend his money on partying that he earns from working. Unlike my brother I've think of people before myself, I would never yell at my own mother and father that I hate them because they are only doing their best. As I said, he is about to turn 21 and for his gift he is getting to go to Vegas on my fathers saved up air miles. Now school is almost starting, I'm a girl in going into my sopre year and he's telling my mom he wants a suit for when he goes to vegas... That money is probably going to leave my school supplies and my new clothes fund short... I'm sorry if I'm venting to all those strangers out there, but now, the last thing I want is to put trouble on my mom and dad, which is buying stuff that I don't need. I'm left on my own alot, it used to bother me at first but now I don't care, I spend alot of time on the computer and talking to my friends and writing so it takes up my time. I know it's bad to feel "GUILTY" when I'm shopping with my mom for like one or two times in the year where I'm actually getting a couple of shirts and some jeans, but I don't know what to do. All of this is piling up, and I feel just so left out and depressed, and most of all I just want to do something about it. But I CAN'T, I will never be able to, because I don't want to hurt my mom or my dad and make them feel guilty about anything. I've been crying alot lately, and summer isn't helping me. I need some advice, anything will help..