Honestly you're not alone. I also recently decided that I wanted to work on losing weight.
I was a stick in highschool and then once I got out I gained about 30 pounds and I would love to lose 15-20.
I've already lost some and really that's just because I switched soda to water. It's a small start but it sure did a whole hell of a difference on my body and the way I felt. I felt so much healthier without drinking all that soda. It's hard to just one day change up your whole diet but if you want to start small then just start by drinking water.