First off, love how you are identifying your career path. Doing something that's meaningful to your own experience will be the upmost rewarding endeavor in the long run. I can certainly empathize with the struggle and I'll try to give you the best advice moving forward.
You're right. There's a ton of forks in the road ahead and there's plenty of paths to chose that will ultimately, ideally, be the right fit to help with kids growing up in their darkest hour. Here's a few to look into:
-daycare owner or worker
-patients rights advocate
-child life specialist
And of course think about being a psychiatrist or psychologist. Psychiatry will take a lot of schooling, easily over 7 years from undergraduate, as you'd be administering medicine. Psychology also will require extensive graduate school and training that will allow you to operate in a certified professional field. Both great career paths.
Regarding what schools how long it'd take, and specifically, what profession: that one's on you. You need to buckle down and read into what schools in Canada have the best psychology programs, what those prerequisites look like, and how you can get loans through their US sister schools (assuming they have one which they should). Be focused on schools that have a proven pipeline to higher education or an institution that has a built-in practice for helping youth, as you'd like to help them.
BTW, I went to grad school in the UK (from the US) and had the loans financed by a sister school in Chicago. Honestly, it's a lot easier than you'd think and often cheaper. Just need to make some phone calls to Nelnet!
And when you get into that college, own it. Be part of relevant campus groups and let it be known what you are studying and what you want to do. Be emboldened by your passion and that will help you in class and in your career!