One nice thing about all those preportioned foods is that they have the calories right on the label, and someone has taken the time to even box it up for you. In order to have some reasonably tasty food, all you have to do is learn how to microwave it to your preferences.
As for alcohol.. Well, those are some experiments and choices you're going to have to discover, but do yourself one big favor: Don't drink around people you do not trust completely. If you do, you're lucky if they just paint you up with magic markers.
You are so light, you can't absorb much alcohol; so if you do decide to go out drinking, make sure to do it with people you know and trust, and learn your limits. I know that part sounds like a public service announcement, but it is a lesson hard learned in life, and I do not want to sound like I am anti-alcohol (I'm not), but I do believe it is important to drink safely and know your limits.
Just remember that when it comes to eating a healthy diet that knowledge is your best tool

If you plan out a meal to have at each of the fast food places you are likely to go to, you will have a powerful tool in your hands. You'll also know exactly how many calories you are taking in.
