Write My Novel?

I have been having an internal debate for the last couple of months. One of mt coworkers Cheryl and I have been talking about writing. (everyone is an aspiring author). We challenged each other to publish our first novels.
She just published hers on Amazon in digital format. She wrote hers 23 years ago, and it is really good. My first novel is really bad. (Trust me, I wrote it at 16).

My debate comes from whether to try my hand again now that I have more life experience. I have the concept for a genealogy mystery. I have always wanted to write, but can I justify the time spent.