This question has no sure answer. Every moment one experiences contributes to something later in one’s life.
To assess if anything is worth “it”, you need to first define “it”.
I have been involved with FTC for 10 years as volunteer, coach, referee, judge, etc. I have witnessed many students’ growth on a wide spectrum on various perspectives, some technically and some mentally, some quickly and some slowly, some eagerly while some reluctantly, but everyone grew, me included.
On the other hand, since you’re just starting high school, it is a good idea to explore as many opportunities as you can. Maybe you can talk to your coach so that you focus on doing one thing for the team that would not take up so much time. When I was coaching, I had team members in charge of things like making 3D models, designing the notebook layout, designing team t-shirt, building spare slides, taking pictures, editing videos, etc. Taking these tasks allowed the members to stay connected to the team while being flexible on their schedules. Some later decided to be more involved while some drifted away.