I will second the "GO ANG" route. Since you mentioned UCLA I assume you are near LA, there are at least a couple of units in the area. I don't know much about California so you can check out the exact spots for yourself @ goang.com. I was in a similar boat as you 10 years ago, college was fun but I lacked the motivation to apply myself. I enlisted in the guard, got my degree (paid for by the ANG) and got to work an awsome job in the process. Not to mention the fact that if you get into a flying unit (obviously highly recomended but not required) you will be hanging out with the dudes who will be hiring you in a few years. They will see how hard you have worked, you dedication, etc and it will undoubtedly reflect when the hiring board makes a decision.
As far as enlisting AD, I know a couple of guys from UPT that were prior A.D. Enlisted and they definitely had a more difficult time getting to OTS/UPT than ROTC or Zoo guys. Having said that, they are at UPT so it isn't impossible. One final thing to think about is that you can always join, spend the minimum (4-6 years) and then try and find a guard unit to apply to if the active duty route isn't working out.
Bottom line is that if you are willing to work hard enough (as many of the dudes on here can tell you from their experiences) nothing is impossible in the Air Force. If you want to be a pilot bad enough you won't go wrong with any of your options, therefore if gaining some maturity and finding a different path for your life as an airman is what you think you need, go for it.