Aren't you under 20? Why so much focus on a career that lasts a lifetime and worrying about fatherhood that's probably not going to happen for a decade? It's highly unlikely you (or anyone) will be in any career much longer than 5-10yrs so it hardly matters at all what you start out doing. The days of lifetime careers are over, if only because corporations and employers just don't work that way anymore. Staff turnover happens whether we want it to or not, often at the hands of a takeover, restructuring etc. I'm in midlife and have already had three serious careers all in different industries. Not for lack of sticking it out on my part, but through circumstance and just the way the world works.
If you hate regulation and want creativity then I can't imagine why you would go into anything that lacks it. And here's a little secret in life....you will never be more free to choose than you are right now. The further down the path of adulthood you get, the more likely stuff like mortgages and children will inhibit your choices in life. Go for your dreams now unless you want to end up like most people and regret the things you didn't do when you had the chance.
I'm lucky, I've saved in my younger years and don't have a family so I am free to make those choices now, but that's not the situation most people find themselves in, in midlife. Since you are wanting a family I can't see you being able to just toss it all in at around 40 to suddenly start following your dreams. Your children will likely be early teens or younger at that stage and in need of stability.