Hey man, so back in November of last year I was 255. I am 5'11 and Im 24 years old. I work a desk job and typically in the office by 8:30 AM, home by 11 PM.
I'm at 221 right now. I've only really started going to the gym in the past month or so. 20 of the pounds I've lost is just walking more and controlling my diet.
6.5 pounds isnt a bad rate of loss, but I'm sure you were expecting more dramatic results. The most important thing in the world right now is for you to count your calories and weigh yourself only once a week (in the beginning)
I have a fitbit and use the app to track my calories, but I hear great things about myfitnesspal. Use (this calculator)[http://www.bmi-calculator.net/bmr-calculator/] to figure how many calories you need a day to stay the same weight, if you want to lose about 2 pounds a week 8-10 pounds a month then you need to be at a 1,000 calorie deficit. So if your base is 2200 calories a day, you should be eating 1200. BUT WAIT! 1200 calories is WAY too little for a guy your age/weight to be eating and looking to lose weight in a healthy manner. Luckily your exercise regimen will increase your BMR, giving you enough room to eat more and still be at that deficit.
Your weight is going to fluctuate wildly over the course of the day. Of COURSE when you drink water your weight will go up, you just put something in your body right? Just like your GPA doesnt give you the whole picture, neither does the number on the scale.
The point is, you can do this. You've made a commitment, and you're on track. Even if you kept on this path, losing weight at the same rate then in a year you're going to be 214 pounds. In two years time you'll be 175. You're going to fail. You're going to fuck up. You're going to give in and eat way to much one day, weekend, week. But the most important thing is that WHEN you fail. You get back up and keep going. Failure is fine. Failure is good!
If your goal is to look fitter and healthier for your friends wedding, then gauge how much time there is left, find a program that fits that time frame and STICK TO IT. There is nothing more effective than consistency. I'm getting married in 4 weeks, and I am no where near the weight I told myself I was going to be a year ago. That doesn't mean I'm going to stop going to gym because I'm never going to hit that weight. It means I'm going to try that much harder to get as close as I can because I said I would try for the first time in my life and god damnit I'm going to do it.