I'm a 28 year old Korean-American wildland firefighter with the Oregon Department of Forestry, so I can understand where you're coming from. In fact, I was confronted with pretty much the exact same challenge when I was your age about a decade ago. And like you, my family wasn't too crazy about it when I decided to go into this line of work.
But like my parents, I think yours are coming from a place of good intentions. Clearly, they care about you, and they want you to live a happy, healthy life. For a lot of parents in Asian immigrant communities, that's equated to prestige and prosperity, which they know can be attained through tried and true careers such as medicine, law, engineering, accounting, etc.
And while it seems they have a negative and uninformed bias towards the field of forestry, I think they're trying to express a valid concern: the challenge in this field, like many other blue-collar jobs, is that while it may provide immediate and tangible enjoyment, as well as a meaningful service to your community, in the long run, the job may limit you in fully developing your potential skills and financial mastery. Obviously, life is not about money, but money can help create opportunities, and you will find real joy in having the freedom to shape your own life. Also, if you want a family in the future, you'll want to keep them in mind since it's hard to provide for a family on most blue collar wages.
As someone who's worked a lot with his hands (shipyards, warehouses, construction, vineyards, firefighting), I tell ya, I absolutely love it. It's one of the most rewarding things I've ever done. But I also don't want to be digging firelines in smoke and ash while humping a hundred pounds of gear and water up mountains when I'm 50. Some do, like a few salty ol' smokejumpers and hotshots that I've met, but they're a rare breed. And injury is also a very real possibility. If I haven't developed any of my skills besides my physical strength and then end up getting seriously hurt, I'll be very limited in what kind of work I can do.
I second what michifreimann, shyGuy2392, and Aequitus64 said. They gave really solid advice. If you do go into forestry, aim for a master's degree that is relevant to that field. That way, after you earn your stripes and put in some good work in the field, you'll have the option to move into a management position where you can still ride out on the rigs into the woods but don't have to break your back anymore. Also, I've heard from my friends in the ODF and the US Forest Service that in order to succeed in forestry, it's really helpful to specialize in a field, e.g. silviculture, soil science, fish and wildlife, etc. And that's something you can do in grad school after you get an undergrad degree in general forestry, so you have time to find your interests.
For me, through firefighting, I've found that I love and have a knack for incident command, so I'll be going to grad school in emergency and disaster management next year. While getting my master's, I plan on spending a few more summers having fun and saving up as a firefighter while I'm still young, dumb, and strong, and then I'm going to work as an emergency management leader at the local, state, or national level. It'll still be challenging and meaningful work, but it won't be as physically demanding, and I'll have the time and resources to enjoy being with and providing for my family.
And as for my parents now, my mother is really proud of me. And I know my father who passed away would be proud of me too (he was the first Korean-American police officer in San Diego, CA). Honestly, it wouldn't stop me if they didn't approve of what I do because it's my mission, but the fact that my mother supports me now does mean a lot. And really, she's happy because I've found a good path for myself where I can help others while also being able to take good care of myself and my future family. I bet your parents would feel the same way if they knew how much goodness and happiness would come from you pursuing your dreams and goals. It'll definitely take some time for them to warm up to the idea since it's such an unconventional career for Asian-Americans or Asian-Canadians (Canasians?), but if you show them that you're serious about your desires by coming up with a solid plan and pitching it to them like it was a professional meeting, they may get on board.
But even if they never do, fuck it. Bro, I think you should do whatever the hell you want to do and feel called to do. I have friends who became accountants, lawyers, engineers, etc. and they're miserable. Don't get me wrong, they're stashing away a pretty penny and they may be able to do what they really want to do in the future, and I also have friends in those fields who really love what they do, but the ones who don't seem to be just eking out a pretty sad existence. This is YOUR life. You could die a shitty, sad death on your deathbed, regretting a lifetime of crunching numbers on a computer screen in a cubicle, or you could die with a smile on your face, grateful for the trees and mountains and rivers that you got to enjoy and protect for future generations. (There are also many other ways that you can die, all in varying degrees of shittiness, but I think you get my point.)
Good luck, bud!