Upset my girlfriend by telling her she should be happier about her future job decisions, but was I wrong for saying that?

Anonymous
So it's a long one so I'll try to shorten it down.

girlfriend is currently teaching, she couldn't do it due to the stress which is understandable and moved to doing 3 days while doing tutoring on the side. Her dream job is to become a tattoo artist but she needs to do an apprenticeship which is unpaid but has to pay bills/rent.

I offered a solution to help her so that she could achieve that dream. We move to an area where it costs less for similar sized place and I'll pay her rent, so she only needs to pay £250 for bills, can work in a school 3 days and tattoo 3 days as an apprentice, that would be for a year. So I'll be paying like 10k more for a year. She keeps saying she appreciates what I'm doing, best boyfriend ever but complains about having to do the 3 days work and not sure she can cope.

After the year, I should have saved up enough for a deposit for a house. The plan was to buy a house together with that deposit and she would have to work at least 2 days still in teaching and 3 days tattooing just to make sure there is stable income while building up clients as she starts tattooing she will probably earn half of what she does teaching if she did it full time straight away. I also said I would be happy to help out with money still. She then complained about doing the 2 days saying she feels stuck, how long will it be for, I feel like I'll be doing it the rest of my life.

I then said to her that she should be happier, its only 2 days its not like its forever and at least she gets the chance to actually do her dream job which most people don't get the chance to do and she should complain less about the 2 days as she will eventually go full time into tattooing.

She then called me a d**k said I can't believe I told her to be happy when she will be stuck in teaching still even if it's 2 days, went into another room and locked the door.

I'm wondering if I was wrong in what I said or not?
Upset my girlfriend by telling her she should be happier about her future job decisions, but was I wrong for saying that?
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