Finding comfort when the one you want to doesn't provide it

So right now I have this urge, this feeling that ministry is the calling in which God has put upon my heart. Last week at Bible and Beach this became abundantly clear. And with the idea of being a full time missionary as well all things are more confusing. But the clarity of it all is that I am not wanting to be an engineer for the rest of my life. I am looking at going back to school in the summer by taking some online courses and night classes pursuing a degree for high school ministry.

I kind of hinted at this towards my mom today and she wasn't against it but she didn't have any enthusiasm. In fact the words that came out of her mouth were if I could take night classes and then when I told her that I think I am wanting to be a minister or missionary she said that I need to be financially well off. Which I proceeded to tell her that God will provide. I understand that she wants me to be financially stable and I am, but I would love to hear her say, "That is good that you are pursuing something that you have passion for and really want to do." But instead no.

I have done engineering for her, I have given it a try and it is just not for me. I wake up everyday asking myself what am I really doing? My passion is not in engineering. I wish she would understand that I don't care about money. I want to be happy doing what I do for the rest of my life rather than regretting or wondering the "what ifs"

I can't do this for my mom...it has to be for myself and God. And I am going to do this regardless of what my mom says, it would just be nice to have her be happy that I am wanting to do something I would love.

How can I deny this passion that God has put in my heart. I am ready to MOVE.