Yes, I found out in my late 30s. What is your career? Mine sucks, Looking back, I now realize that I took it because it pays the bills, I'm trying to change but it's difficult when you are in your 40s with kids.
I also realized that I had spent so long pretending that I didn't have the foggiest who I was. I was a software engineer, a scientist, a technical manager, a business analyst, a wife, a mother, a face painter, a friend, a photographer.
Each iteration of me became a fully fledged personality, down to the point where my name has changed accordingly, I use variations of my name, my middle name and several completely made up names. At my wedding, my school friends met some people I worked with, and when they talked about me, apparently they were confused as to if it was the same person.
I even went through a phase of wondering if I was anything at all, without the masks or the personas, is there anything even there? I don't really feel much, I'm really very neutral, I went through a phase of thinking that maybe there is no me?
The next phase was miserable! I called it a mid life crisis where all I knew was that the current iteration sucked. I was trapped in a job I hated, if I quite I could lose my house and my kids would suffer, if I changed then I would likely get a job doing exactly the same but with less money and more travel. I spent a few years being depressed at this point!
But after 10 years I can confidently say that I'm through it. I realize now that I am simply me. That I don't have to "be" something, or call myself something or define myself by my job. It's okay to just be me. I realize that the trapped sensation is in my head and in actual fact everyone is trapped to a degree, at least I am trapped with an awesome coffee machine and a family that means the world to me. Not only that, I now know I can be whatever I want if I choose to. So mostly I am a working mother with a strong moral code. So once I let go of my hang ups (feeling trapped) and everyone elses expectations (how to define me), I found an inner peace and am now comfortable just being me.