If you graduated in a STEM major, is it too late to jump ship?

I feel I’m genuinely curious about other fields, mostly marketing. I’ve only been in the job market for around a year but I’m really struggling with the idea that I’m going to be doing this for the rest of my life and want to make the leap before I get older. I’m just wondering if that’s even doable or if I’m being crazy?<br><br>Edit: I’m working as a data scientist right now