Honestly I don't want a 2nd kid because all I value is my free time.
Why would you value your free time over having another child?
I do my favorite hobbies without having to take care of others.
It's understandable that you value your free time. Not everyone wants to have a lot of kids and spend all their time raising children. If you don't want another kid then you might want to talk to your partner about the topic to make sure that you two are on the same page together.
I've talked to my girl and she supports my view. We will only have 1 kid.
I'm glad you communicated this with her. It's good that you both are on the same page. That way you will be able to focus on your hobbies and maintain a healthy relationship with your child and your wife.