want to work

Ok so here goes. I'm new to the board and this is my dilema. I have 2 boys ages 9 & 5. I have been a stay-at-home mom for 7 years. My 5 year old will be entering kindergarten this fall. And I am ready to begin working again. My dh does not understand why. My oldest is from a previous marriage and when we got married my dh said he wanted me to stay home with my son. Which I thought was the greatest thing since he was not his son and he was 3 at the time. I never had that option when I was married to my first husband. I was home about 1 year before getting pregnant with my second son. We decided I would not work while he was little. We never set an age when I would return to work. I have been very involved with my older son at school and my younger son at preschool. Now that he is going into kindergarten I thought I would work. I'm ready I'm really tired of being at home. I want some adult conversation. My husband thinks that I should remain at home until my younger son goes into 5th grade. I was like are you kidding me. I can't do it. DH wants me to be as involved in my younger sons school activities like I was with my older son. I didn't say I would not go on field trips and stuff I just want to work. I will be working for the school system so I will have off when the kids have off. My husband says I should be thankful there are a lot of women who would love to stay at home and would envy me. I realize that, but he would be fine with me staying at home the rest of my life. Sometimes I feel he does not want me to work because he has it so easy. Dinner ready, clothes washed, house cleaned, kids taken care of, and all he has to do is go to work. And if I were to get a job all that would change. He would have to help me in the morning pack lunches ect. He would have to go into work later to help me get the kids to school. He would have to cook dinner because the kids play football and I would not have time after I got home from work. Football practice is 3 nights a week, games on Saturdays. Am I being selfish? I feel I have done so much and I deserve to do something for myself now. So I just wanted to know how you feel?