Good topic, I go through cycles every couple of years where I get frustrated with where I'm at in life. Personally, I'm quite content.
Financially, paying bills just to live is aggravating to me and I have no desire to work until I'm 65. I wish I had that entrepreneurial spirit! I've got friends who start their own businesses, change industries, and I'm impressed. I've started to focus hard on my financial future recently and I'm excited with the investment opportunity over the upcoming years with the Internet of Things and the flood of states legalizing cannabis. I never paid attention to trends previously and now read through my 401k and IRA statements in quite a bit of detail.
Still, I wish I went into a higher paying career so I'd have a better chance of retiring early. No guarantees though as a health issue is all it takes to wipe out everything.
I don't think there is anything wrong being unhappy with your life as long as you are taking steps to better your situation. Realizing something needs to change is the first step.