I need a change in my life so bad?

I am a 38 year old stay at home wife and mother. My life, since I was 19 years old has been about being married and taking care of kids. I was married at 19 to my 1st husband, we had a daughter together and divorced after 11 years of marriage. I thought I was ready then to start doing stuff for myself, my daughter was then 7 years old, spent half of her time with her dad, and so I decided to try to go to college. But then I was impetuous and met and fell in love with the man who is now my husband. He was in the navy and so I put off going to school to pack up myself and my daughter and go to where he was stationed. That was almost 8 years ago, since then my hubby is out of the navy, we have had 2 little boys who are now 1 year old and 3 years old, my daughter who is now 15 yrs old lives with her dad, and here I am. I stay at home 24/7 with my boys, I travel to go visit my daughter twice a month, I go to the store once a week, and I have a great relationship with my husband, but that is all I have. I do nothing, I have no friends here where we live. And I just feel so, well, like an animal who is caged up. I am so restless. I work my *** off around here, my house is spotless, I cook like crazy, my boys are very well taken care of, and yet, I have nothing for me. I am working on getting started with school again, just registered for the fall semester. But I need more for myself. And I have no idea what that "more" is that I want or need. I love my husband and we have a great life together. But, I am going crazy here. Is anyone else going through this? I totally feel like I stagnating here. What can I do for myself? Give me some good, constructive ideas please.. Not anything that will hurt me or my family or marriage.. I need things that I can look forward to for myself.. School is a great start, but I need something more. Thanks!