Feeling Down

My husband and I got married young and I love him to death but it's hard cause he is in the military and I gave up my dream for him. I'm not saying that I regret it cause I don't but lately I have been down he gets to go do all this cool stuff and is bettering himself but I feel like nothing i do or can do is something that only is for me. I feel like there is no purpose to life at times and feel myself becoming depressed. Has anyone ever felt hopeless or really down and just want someone to talk to but feels like no one will understand?