Having a hard time accepting my partners career choice... help?

I'm having a hard time accepting my partners career choice... and not sure what to do...

I'm 28 my partner is 26, originally we spoke about having kids/ a house etc. When I turn around 30. She is currently earning a good amount as a teacher and we will end up moving soon so she will end up earning around 40k.

She wants to cut down on teaching and go into doing tattooing, now the plans we had for a house have been put aside.. and at 30 if she starts now we can't have a family/kids on the starting salary she will be getting and it will be a good few years after the apprenticeship is done till she is earning a similar amount.

I'm wondering if I'm being selfish or not... as this idea affects me as well and I'm not happy with it fully... I want to be supportive but it means for the 1st year or more of the apprenticeship she will have to do... I'll hardly see her, we will be struggling for money and I'll be paying her share of the rent. I'm at the age where I want to travel etc. go places and she knew this when we got together, I want to do it before I get too old. Once she finishes, with the amount expected... we will be struggling on mortgage payments or at least she will and currently I'm making sure she is alright every month as she is always worrying about money or crying a lot as she doesn't feel she has enough. I've done the hard work over the years of getting to where I am on a decent salary to actually enjoy life and relax more. I honestly don't want to feel like I'm struggling/stressed all the time... while also hardly seeing my partner as the apprenticeship takes a lot of time

Any thoughts/opinions on what to do? Am I overreacting?
Having a hard time accepting my partners career choice... help?
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