The 19-year-old scored 12 Serie A goals so far this term, but his contribution was canceled out more than once, including the latest two defeats to Inter Milan and Sampdoria.
The Brazilian also scored in Milan's UEFA Cup 2-2 draw with Werder Bremen last week, which eventually saw the Italian giants crash out of the competition on goal difference.
"My goals aren't of much use because we aren't winning and that's what really bothers me," Pato reporters.
"It's too bad that I've scored 15 goals this season but so many have been useless."
Pato hopes that his team could at least secure a Champions League spot next season, amid their UEFA Cup and Coppa Italia failures, in addition to their poor league position.
Milan trail leaders and defending champions Inter by 12 points in the Serie A, having lost six times so far this season.