Can I opt out of Obama care and pay the fine instead. I was gonna enroll, but the cheapest plan I have found will cost me about half of what I make a year? Also Can I buy it for this year’s taxes and cancel shortly after so I can avoid paying the fine this year?
You don't really opt-out of Obamacare, but you have lots of choices. No plan should cost more than 9.5% of your income with cost assistance. If it does then either you make too little to be eligible for subsidies (and your state didn't expand Medicaid). Or you didn't apply to HealthCare.Gov correctly.
If your plan truly costs more than 8% of your income after deductions, then you can apply for an affordability exemption.
In general no one has to get covered, they have to choose between coverage or paying a tax called the Shared Responsibility Payment. That payment is based on income.