Stop falling for the usual story. Media polls don't matter, internal pols do. And you'll never see those. Therefore, stop paying attention to polls, especially when they constantly show Clinton being ahead of DT.
Mainstream media lies. Polls are one of the ways they lie. They cook the polls, then they take the cooked results and massage it further so the reports on the polls do nothing but advance the Narrative- and in this Presidential cycle, the Narrative is meant to pull Hillary into the White House. Trump bad, Hillary good. That's their intended slant in all reporting.
Trump knows this. That's why he's treating the media as he has, demonstrating his contempt for them while showing us that we don't need them, and that's a big reason for why it will take an assassination to stop him from beating Hillary in November. (Election fraud? Hillary may want it, but her side isn't yet suicidal so they won't go for it.)