Ronaldo joined the Bianconeri for €100 million this summer but failed to score in his first three matches despite registering nearly 27 shots.
Cristiano Ronaldo's wait for his first Juventus goal ended on Sunday with the Portuguese netting a brace in a 2-1 win over Sassuolo.
The 33-year-old then finished off a rapid counter-attack by shooting into the bottom corner after 65 minutes.
"It's human to be like that, sometimes we can't control our anxiety", he said.
"It's the competition I love the most", Ronaldo said.
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Ronaldo has won the Champions League five times, including each of the last three seasons with Madrid, and one of Juve's prime reasons for signing him was so they could win the competition for the first time since 1996.
Juve's shirt is the top seller in Italy, with Real Madrid's second and Inter Milan's third.
The five-time Ballon d'Or victor broke his duck just days after Juventus manager Max Allegri backed him to find form against Sassuolo.
The relief and joy at scoring his first goal for his new club was evident on the player's face.
Bolstered by five-time victor Ronaldo, Juventus begin their quest for the Champions League title which has eluded them in two decades in Valencia next Wednesday.
Costa said on Instagram: "I would like to apologise to all of Juventus fans for this misleading reaction in today's game".