Sure. But keep in mind, what we've told you so far applies to other Canadians as well - if you're not resident for a certain period of time, you don't have health care (in most provinces, I don't have details for every province). In point of fact, I don't either, despite having spent most of my life in Canada.
You also face the challenge that although you likely are a Canadian citizen from what you've said, you don't have documentary proof of that, and if your parent did not register your birth abroad / file for citizenship, the Canadian government does not know you are a citizen - at least from what you've said, it has no idea you have a claim to citizenship or even exist, really.
Assuming you are a US citizen, you can likely enter Canada and say at border "I believe I am a Canadian citizen by my parent"; I doubt they would deny you entry but until you got through the process, you are only a visitor who believes has a claim to citizenship. (I should flag, I have no idea how the border people would treat this - by law as citizen you should enter on Canadian documents - don't know what they do for those that don't have them)