Sure. It is a great site for those types of things. You'll find a lot of people with the same issues here (including me).
The site is huge and complicated. It can be a little overwhelming at first. I recommend doing some of the "how to" tutorials and go through the process of getting started, setting up your SparkPage, setting some little goals, etc. one step at a time. Don't try to do everything at once -- and you'll soon find that you have established a strong foundation to maintain a healthy lifestyle.
Good luck to you! ... and WELCOME!