Two of your shots on target were pea rollers.
The better opportunities were from united. I already listed them, but let's do it again.
Before you scored
Pogba shot wide when clean through and Zlatan had one on the roof of the net from the weak backpass.
After you scored we had Zlatan's free kick, Mikhi's saved shot, Martial missed the tap in, Rooney had one excellently saved when wrongly flagged offside (note, would not be included in our on target stats), Fellaini hit the bar and Zlatan scored.
So arguably seven good chances to your two (Firminho and Wijnaldum). You created nothing else if note and got a daft penalty to go ahead.