Not very happy

I don't feel very well these days. I am kind of Depressed and tired of every thing. When we are younger we have so many dreams but when we grow older, have job, family and kids we see things did not turn out the way we pictured it. I know I have a lot to be grateful for and I know that these feelings are temporary but every now and then I become so hopeless, I think I am going through mid life crisis or hormonal change. Sometimes I think I was not born for all these responsibilities, work, kids, husband, etc. these days I easily get tired and upset by my kids they are two playful active and sometimes not very well behaved boys and I want them to be perfect so when I see they don't listen I become very upset. At work I have too much responsibility and that's my fault because I do things quickly and effitiontely so who is better than me to dump the projects on. Any way I just wanted to nag here a bit . I will take two weeks off from work in August and we go on vacation. Hopefully that will make me feel better if kids let me enjoy it:(