For ECs, you should do what is right for you. Whatever you do, do it well. Treat other people fairly. If you get into a leadership position, then remember that leadership is primarily about listening and making the activity better for everyone, and specifically is not about getting your way.
Since you are participating in the ECs that are what you care about, this sounds like you are doing exactly the right thing. Don’t worry about what other people are doing for their ECs. That is their business.
It goes both ways. Most students have ECs that have nothing to do with their major. Some students have ECs that are related to their potential major. In my own family I have seen this go both ways.
It is mostly top ranked universities in the US that care. They have a problem that they have way too many applications from students who are nearly perfect in terms of academics. They need some other ways to differentiate between applications.
Some schools will not even ask about ECs. One daughter for example only applied to universities in Canada, and none of the specific schools that she applied to asked about ECs at all.
ECs can show an ability to focus on something that matters to you and put in consistent effort over time. ECs can show an ability to work well with others. These qualities can then be applied to a very wide range of future efforts.
Regardless it sounds like you are doing well.