It's brutal, yes. But I think for older new teachers, it's not nearly as brutal. You have to remember that the "traditional" teacher is 22-23 years old, fresh out of college, fresh out of the bubble wrap. They're not really used to the concept of "Keep your head down and do your work," nor are they used to not having substantial free time to structure as they please. I really think that's why they have so much trouble adjusting to working in a full-time career rather than just part- or full-time jobs. (I'm sure someone will begin regaling us with their story of how they worked 40+ hours a week and went to school full-time and all that. Cool. Good for you. Not what or who I'm talking about.)

I say go for it. Yes, it's brutal. It takes 4-5 years to really adjust to it and feel okay doing it. But that's any regulated profession -- law, medicine, etc., are grueling gigs the first few years. Unfortunately, though, medical graduates tend to earn triple-digit returns on their education investment. Teachers earn negative returns on theirs. And that's criminal. But alas.

If you do data science now, I bet you'd have no trouble finding a niche in math or science classrooms at the high school level. In fact, with your degree, there might even be opportunities to teach courses for the local college at whatever high school you land at as part of your regular high school teaching duties.