Oh, what sort of trouble? Court action? Are you going to spend huge amounts of money to fight the IRS seizing your assets for failure to pay the tax for not having the coverage when you had the opportunity to have it? Are you going to risk a prison sentence for tax evasion? Are you going to risk having liens placed on assets, have your house sold from underneath you, all because you have this weird notion that you don't need to have health insurance coverage? If so, you are a fool.
Sure, the government cannot MAKE you do anything. You have free will and while the law can compel you to do something, you can simply refuse to comply. But if you do so, there are consequences. In this case, it's 1% of your gross income or $95 whichever is more. You can refuse to pay the penalty but if you don't, the government will come and take it eventually... and if you refuse to do it often enough, they may eventually come after your physical body as well.
Frankly, if you qualify for health insurance coverage, especially for subsidized coverage, and you can afford it and you come down with some horrid disease like cancer, you will get no sympathy from me and thoroughly deserve to be driven into bankruptcy because of your foolishness. Let's face it, healthy people can get very sick, get hurt in accidents, etc. etc.