How can I get back to being the person I was?

I'm 25 and in the past year, I've bought a house, got in relationship, and got married. My husband has made the comment that I am not as fun and carefree. And it occurred to me that it is true. I' dont' drink anymore, maybe a gl of wine once a month. and I know that I am feeling increasingly blah. Thing is, I used to be the life of the party and always organize social events and have a blast with my friends. I was outgoing and goofy. Now I feel like I'm just a bump on the log, or the only one who is being "sensible". I think maybe alot of it has to do with the fact that my husband is a big kid and I feel like I have to be responsible 24/7. Also, with money being tight, we can't afford to go out and just blow money "having fun". I feel very frustrated. Has anyone else gone through this???