I used to eat all that stuff, all the time. On a spaghetti dinner I could easily down 4 pieces of delicious garlic bread, a massive amount of pasta, and usually soda or milk. Its not easy but you have to force yourself to have a little willpower. Start out by not going for a second helping at dinner. Use smaller plates so it looks full. If you have a separate income, and you can even in the slightest afford it, go get fruits and veggies. For meals, veggies should take up about 1/2 your meal, are filing, and great for you.
Being tall, you don't have to cut down to 1200 or so, to lose weight xDD so your lucky in that aspect.
Drink alot of water.
When you feel like snacking, drink a glass and wait a bit. If your still hungry, then eat, if not, you avoided eating for the sake of eating
Start exercising. It'll help with the weightless especially in the beginning. If you can't afford to go to the gym, either use exercise videos, or start working your way up to walking a few miles a day. Use any excuse to just keep moving.
Start logging your food/calories in a journal. Expect that some days you will go over and don't let that discourage you. Once you start logging, you'll be amazed at how many calories are in your fav food. I think I was eating close to 4,000 a day before I started losing 0.o..If you don't have the patience to log food, make sure you read the back of the packaging, and keep an estimated amount in your head all day.
Good luck.
Theres a quote going around here "A year from now you'll be glad you started"