Michael Laudrup's side trailed the Royals by two goals before Michu reduced the deficit at the Liberty Stadium.
"It was very strange because we were 2-0 down at half-time but we had all the possession, the territory and the chances," Michu told the club's official website.
"We spoke at half-time and we had the belief we could win the game. What we needed was an early goal, and we got that, and then we just kept putting them under more and more pressure.
"Wayne took his goal very well and we thought we could go on and win the game.
"It is frustrating to only come away with a point because we created so many chances, but we fought back very well and it stopped the run of defeats."
Michu has scored five goals in his seven league appearances since joining the Swans in the summer.