I walked out on my girlfriend and her son
What was your reason for walking out on them?
I am here to live out my dreams and not to raise a kid.
Choosing yourself over a child and partner isn't going to do you any favors. You shouldn't start a relationship with someone, especially someone with a child, if you plan on abandoning them.
At least I won't get wifed up. And I still got my dream.
Well you can still live out your dream while having a family and a kid. Sometimes  having a family can be a strong motivator for someone who is pursuing their dream.