How do I explain my baby-mama situation to my friends and family?

I met a woman and she decided she wanted my baby. I’m a decent breed and she thought we would have a good looking baby. We do. I was never with her in a commited relationship and was never supposed to be a father figure. I’m a stud basically, but I do send a little money and visit a couple times a year. My friends don’t get this and think I’m wrong and a deadbeat dad. Maybe I am a little, but me and the mom have an understanding, and we get along amicably. This is a little personal so I expect some static from some people.