What the OP fails to recognize, is that even though he is young and healthy, takes care of himself and makes good decisions, like all of life, SHIT HAPPENS. You might fall and crack your skull, get some weird disease, cancer, or even a bad case of the flu. You just never know. Then what if you don't have $500k to cover your expenses? The rest of pick up your uninsured tab.
The idea that Obamacare is not a true marketplace because of all the insurance requirements is a fallacy. You could say that the car industry is not a true free market because cars have to have seatbelts, airbags and lights. "But I only drive during the day, I don't need a car with lights!" The requirements are there for our benefit. For example, it was IMPOSSIBLE to buy a plan on the current market with maternity coverage.
Several people have made the point, but I will reiterate: WE ALREADY PAY FOR THE UNINSURED. Hospitals all over the country receive billions of dollars from the federal government to make up for unpaid bills. This money is being redirected to the marketplace subsidies (and is the primary source for those funds, this is why Obamacare is projected to save money). This is also why states that declined to expand Medicaid are screwing their hospitals: the money to treat the uninsured is drying up, and the uninsured are still uninsured (and broke). So the hospitals are slowly going bankrupt.
Finally, for those that are all upset about your personal freedom being compromised, think of all of the other socialized systems in our country: police, fire, military, roads (btw, gas taxes don't even come close to paying for the highway system), airports, schools, parks, FDA, SEC, OSHA. The list goes on and on. There will always be people who pay for services that they don't use.
And back to the OP, you may be young and healthy now, but you will be very pleased that when you are 50 you will be able to get health insurance, whereas under the old system you'd either be priced out of the market or denied outright.