Gamingphreek:
I just wanted to chime in with my opinion:
I respect where you are coming from. I have felt misunderstood, angry, upset, and other things with my family as well in the past. Not to say that I was right in feeling those things every time, but whatever the case, from a family perspective, leaving out the entitlement argument and whatnot, it's clear there was some serious miscommunication going on about this in your family. Yeah, the way they did it was pretty unloving (not necessarily "what" they did, buying the car); and so was the way you handled it. I respect that you were willing to confront them about it , and I could imagine that how you went about it, was probably a lot milder than how most people read it. I know when I say I "go off" on my family, compared to some of my friends, it looks like a minor confrontation, just because I have a relatively better relationship with my family that a lot of my friends. But this is just my conjecture.
At any rate, too, I think it's respectable that you apologized to them. Please though, if you don't hear this anywhere else, make sure that you don't back down on the fact that your feelings were hurt. As people have said, you are not entitled to a lot of things, but if your parents love you, I'm sure they don't want to unintentionally hurt you like that (or maybe they do, in which case, it sounds like there needs to be another conversation). So, to summarize, it sounds like you are upset and confused as towards why your parents would do something that seems to you like they are trying to be mean. Make sure you let them know what it was that felt that way. Give them a chance to provide their story and ask for a chance to provide your story.
Finally, regarding the truck, I empathize. It probably feels like they are a)flaunting this at you; b)not making a logical choice; and c)not including you in their decisions all at the same time. I would theorize that to a certain point, the best you can do is be upset about point a. Of course, with b you can try to have a logical conversation with them removed from points a and c; or with c you can ask to be included in a greater capacity in their decisions (doesn't hurt to ask? maybe they would want to give you more responsibilities with this option) removed from points a or b. I'm sure there is a mature next step you can take to help you and your family grow. I recommend finding it =)
Peace
john
For everyone else, preemptively, I don't see how you can argue with that logic which I just presented. In my opinion my friends and families are more than business relationships. I wholeheartedly believe the US have become an "entitlement society" and that it is one of our biggest flaws as a culture. I am an advocate for change in this issue. And there doesn't seem to be much of an entitlement issue at all in the OP's post. What there does seem to be is miscommunication and hurt feelings within a family. It's one thing to say "I feel hurt because my mom and dad won't buy me a car" It's another to say "I feel logically and emotionally betrayed by my mom and dad" (Not that I think the OP was betrayed, but these are the extremes) But anyway, that doesn't change the fact that we shouldn't seek to have mature relationships that are honest and able to be hurt. I base my opinion upon a wonderful book called "Crucial Conversations" by Kerry Patterson. Briefly, it argues that we need to have open communication for maximum satisfaction for all members involved in any task; that is to say, as soon as someone feels threatened, marginalized, or unimportant, everyone loses. And it is possible to keep people from feeling that way without comprising what you believe. It takes the "suckers choice" (which boils down to "Either I have to be cruel and tell the truth, or be kind and sugarcoat things") and provides ways to turn it into a logical "and" (I can tell the truth AND be kind). Really, its tough to believe this is possible without all the statistics, anecdotes, and research they've done. But, I've found it to be true in my life. As a side note, my local chapter of Intervarsity Christian Fellowship had us that were on leadership read it; it's changed my life in terms of relationships.