First thing - take a deep breath.
You can do this. What you are going to read around here is that it starts with a small change. Pick one thing you do that you know is contributing to your weight and change it. If it is soda, eliminate it. If it is a lack of exercise, start with something easy and start doing it. Everyone has to start somewhere.
Read around the stickied threads, there is some really great advice there about
nutrition and exercise and there are really great people here willing to give advice and support.
Take an honest look at yourself and if you are really ready to make the change, make one and when you have master that one, make another.
Good Luck!