Unless they're breaking the law, the NSA still needs a warrant to request data if you're an American citizen. If you're the subject of an active investigation, law enforcement and spy agencies alike tend not to tell you that and are under no obligation to disclose anything. If the investigation is closed, then you can request data under a general FOIA request, but you'd have to know there was an investigation about you at some point. If nothing else, you'd find out upon being charged and your attorney would get all the data during discovery.

Obviously, a broad sweep program can collect unrelated data, which presumably was part of the concern with PRISM. This has sort of always been the case, i.e. if you put a bug in someone's house, you hear everything said in the house, whether by the subject of your investigation or their kids or a housekeeper or whatever. But whoever is listening is supposed to immediately throw away data as soon as they can determine it isn't needed for their investigation.

So theoretically, if they ever collected anything that came from you, and you were never the subject of an investigation that resulted in a warrant to collect on you, the data should have been discarded and could not be given to you.

You may or may not believe the NSA actually complies with the law, but if they don't, they're probably not going to tell you.