You are doing what you’re supposed to be doing as a teen who will attend college.
You’re working at a summer camp;
You are lifeguarding;
and You are taking care of a younger sibling.
Those are very respectful as EC’s for engineering because it shows that you have discipline and can manage daily work schedules.
These all are good ECs, which are setting you up for what you have to do when you get to your college.
Ask me how I know? I had three children all of them worked at amusement parks restaurants and one worked in a hotel cleaning rooms. Son who worked as a bus boy, got into Caltech for computer software engineering.
Daughter who worked directing lines at an amusement park, is a computer software and electrical engineer double major.
Daughter who worked cleaning hotel rooms graduated from her med school.
What I learned was that colleges and universities want NICE, respectful kids who have worked and have earned a little money and can juggle a schedule.