What does "sign up for something" in this context mean?
"I went through a great deal of trauma in a very short amount of time. My dog was what I needed to not feel alone with all of the things that I was dealing with, but I signed up for more than I can handle. "

Thank you

Question

What does "sign up for something" in this context mean?
"I went through a great deal of trauma in a very short amount of time.  My dog was what I needed to not feel alone with all of the things that I was dealing with, but I signed up for more than I can handle. "

Thank you

Answer

Taking on responsibilities for something. And sometimes too much.