What do I do??!!

I am 3 months in my training to be a hd mechanic in one of the biggest mining companies, i applied for the traineeship when i was in a rough space and wanting to fill a void which i thought meant to smash out working 74 hour weeks 7 days on 7 days off. I am enjoying it and the people there are awesome ( in some ways) but I fear I have this gut feeling it’s just not for me. It’s so mentally and physically draining, the drive to and from work is such a long commute. After the training is done they send us to site. I’m having bad thoughts that I know I don’t want to do it and can’t commit to that type of life style. It’s such a big change to my current dreams and goals. I feel I’ve been pushed into the mindset “finish school, graduate, get a good career and stay in that forever “. And I’m not prepared for that. I want to work in a cafe and take life slow and see it day by day. I also feel so fkn horrible and ungrateful for feeling like this as some people would kill for this opportunity!!
I don’t know what I should do, I’m still on 6 months probation and potentially have a way out. But I don’t want to regret it in the future.
Please if anyone can give me some advice I need help😭 I’m also only 20 so I have all the time in the world!!!