Am I doing the right thing?

I have a good job that pays well, but it seems that that is all I have come to be, just the job. I need time to find who I am, what I want from life. But is it right to want to give up my job to do it. We can survive on my partner's salary, but am I doing this just because I am lazy and don't want to work? I don't even know if what I am doing is what I want to do, if that makes any sense, there are times when I think that I am useless and good for nothing. I have messed up a lot of things, my life, my children, my marriage.