15-20 pounds heavier than high school or college?

I was a runner in high school, cross country, indoor track, outdoor track, joined the cross country team in college and by the time indoor track rolled around I decided I hated college running and quit the team. The rest of college I was pretty good about going to the gym or outside regular with my roomate or by myself to run. However once I moved back home, the running gradually dwindled to only occasionally running I would get on a running "streak" and run for 2 weeks and then not run again for a month or more. This has been going on ever since- 4 years later. Add in the fact that my bf now husband has bad eating habits/loves to eat out and my lack of cooking skills or desire to cook and now I am 15-20lbs heavier- still thin by most people standards, but most of my once favorite pants do not fit and I am sick of it. So I am going to try to live a healthier less processed life style, and run more. Not only because it makes me thinner because it also makes me feel happier and more accomplished.