>>2656341They are really glad that I go outside. My dad believes that physical exercise is the best thing in the world and the cure for everything. I am a shut in computer nerd when I don't go /out/ so they really like it.
Here are some things you can try:
Don't go from 0-100: ramp them up slowly to the fact. Do day hikes. Join a hiking club if one such exists in your country. Go sleep in a hut on an organized club trip. Say you've bought a tent. Then go sleep in your tent.
Find ways to sweeten the deal or overshadow their concerns: I started rock climbing, and I did it with a girl (who was a 4/10 platonic would not bang friend). They were so thrilled I regularly spent time with a girl that they completely forgot to freak out about the fact I was tiptoeing up vertical cliffs with metal junk dangling from my waist (while my dad thinks physical exertion outdoors solves any personal problems, he also despises all sorts of "extreme" and "reckless" activities, like skydiving).
Maybe your parents will overlook the "danger" of sleeping in a tent, if you also do it with friends.
While I probably wouldn't recommend "getting them into hiking", you could at lest show them photos, particularly of stunning views and of your comfortable camp site, and show them on a map where you've been. I hope your parents aren't total assholes and if they see their child enjoying themselves and coming home with stories and wondrous experiences, they will become more supportive.
Finally, consider buying an inreach or similar and checking in with them every night. Follow best practices for safety - leave them a map of where you're going and approximately when you'll be back. If their concern comes out of worry for your safety, be nice to your folks and d what you can to make them feel calm!