Pregnancy and stuff

So Mario and I have been trying for another baby since April of '09. with no success. About 4 months after Connor was born I ended up having my left fallopian tube removed due to an infection. My doctor told me that I would still be able to get pregnant and that it shouldn't effect me. I am also over weight, and I know that has a lot to do with it. I don't have regular periods anymore, last year I went 9 months without one. My doctor told me if I lost weight that I wouldn't have any problems, but losing weight has proved to be very challenging. I hate this because Connor was conceived the first month we tried with no problems. I keep seeing people around me getting pregnant easily and I want to be happy for them, but instead I am completely jealous. I would give anything for just 1 more baby but I have been preparing myself, because it will probably never happen. Is it ok to feel jealous?