Experiences with career reorientation?

Hello everyone,

I'm currently in the midst of professional self-discovery and trying to structure my thoughts. I find this works best when I interact with people, so my question to you is:

I'm 26 years old, have a master's degree in mechanical engineering, and a year and a half ago I moved into the energy industry (or switched careers) and work there as a management consultant. I graduated with excellent grades and I'm doing a good job. However, I'm not really satisfied with all of this because it feels like I've been living a different life than my own—it just doesn't feel authentic. These thoughts have been popping up again and again for years now, and I feel the need to break out of this hamster wheel. But I'm also plagued by various worries because I've built a wonderful life with my girlfriend, one that also requires a certain amount of financial stability, and I don't want to take that away from her.

Is there anyone among you who has been in a similar situation and can give me some good advice?

Thanks so much!

PS: I realize these are very privileged concerns. Nevertheless, they are real, and I ask you to take them seriously or ignore my question. I'm still open to constructive criticism!