That's where meal planning is IMPERATIVE to success! I had lots of people inviting me to stuff too...AND I live with a skinny lil' 12 yr old who loves junk food! AND I LOVE SWEETS! As a matter of fact I'm like you...homemade goodies thrill me! Not sure which I like better...the baking or the eatin...maybe a bit of both!
If I were asked to pinpoint the single most important thing I changed in my life that made the most difference in me reaching my goal, it would be meal pre-preparation...hands down!
For instance...me daughter and I are going away for the weekend. I plan to pack our large cooler and take enough of my frozen meals, frozen grilled chicken, bag of salad, dressings, diet soda, water and cookies/muffins/desserts so that I don't have to eat out one day. I do this because 1) it's habit now; and 2) I enjoy my cooking more than any restaurant and 3) I'm cheap!
Since you like to cook, maybe try making your meals a week or two in advance and freezing them. You'll be surprised how easy this will make the process of saying NO to eating out.
