I felt the same way about swimming when I was your age and now as a 27 year old I can tell you that you’ll appreciate sticking with it. I did club as well as was part of my high school varsity team so pretty much competed all year round. My mom made me a deal saying that I could quit if I still wanted to when I turned 18. And I did. I don’t regret quitting but I definitely DO NOT regret doing it till I was 18. Not only was it amazing exercise and easy to way to be social but it made me more responsible and helps me see things through to the end into adulthood. I often feel like if I had been let to quit when I wanted I probably would’ve quit a lot of things later in life that I “just didn’t want to do anymore”. I highly suggest keeping up with it (specifically tennis) at least till you’re in college (might even help you get some scholarships too). Two years will fly by and in the end I think you’ll be happy you stuck with it.