Well...ok so eating less WILL in the SHORT term aid a little weight loss, but only for a short time. You'll start thinking "Heck I lost 3lbs I can have a muffin" And as soon as you start eating your 'normal' amount again you'll gain it all back and then some. Try to aim for 30 mins exercise a day, which shouldn't be hard at uni, what with running all over the campus to different things. Crunches and sit ups tone a stomach in a surprisingly short time if you don't do any at all right now. To start with, try drinking 8 pints or more of water a day. Don't go hardcore dieting from the word go, because it coud just be water retention bloating your stomach, it's easy enough for girls.
Also, try not to eat after 7pm, because your metabolism slows down at this point and it's harder to burn all the carbs and calories in foods. Be careful with things like breads and pastas, they're full of carbs that, when you don't burn them properly, will be stored instead and be adding to weight gain. They're the tricky ones. Fat grams (urgh it's never ending) you need to be careful of too. Essentially you need a little of everything, just don't overdo it with the heavy stuff, and balance more fruit and veg into your diet. Switch sweet snacks for cereal bars if you're not fond of fruit.
Watch your alcohol too. If you're drinking things like beer/lager etc they're going to pile on weight too, they're basically fat and carbs.
But hey, it's a lot to think about. Maybe just join a swim class for a bit or something.