"I found it difficult towards the end of last season, I didn't get many opportunities." said Walcott, who scored in Saturday's 3-0 win over Chelsea.
"I spoke to many people and woke up something in my system - I am completely different.
"I just want to do better and better, after all the faith people have had in me. Maybe in the past I was thinking about others rather than myself, and I think it's about getting the balance right.
"There are always ups and downs, but it's all about now, and now it is going well.