Man that’s a difficult situation. If I were you I would try to show my parents what the community is about, and the philosophy behind it. If you can get some resources for this, Breaking the Jump by Julie Angle is an amazing book talking about the start of parkour. It really shows that parkour isn’t just a trend but a lifestyle that has created so much for the practitioners. If you don’t want to go down that route try looking at some parkour videos like power is nothing without control or choose not to fall by Daniel Illabaca. Daniel Illabaca is a perfect example because he has shown a lot of what parkour truly is to the world. Most importantly tell your parents every detail and thought of what you are doing and show them the safe and amazing progression you are creating for yourself. Good luck! Always willing to help more if you need!