Playing varsity tennis as a freshman is impressive.
Tennis is more than an athletic endeavor; tennis is a social activity that enables one to meet other individuals in a close, yet non-threatening relationship.
Tennis is a great way to meet others for both social & business purposes.
If you became captain of the tennis team, colleges will notice. This is seen as evidence of leadership & maturity & trustworthiness rather than solely as athletic ability.
I attended an LAC for college. I was very athletic & came in after having been captain of multiple sports teams during prep school. It made a difference in my freshman year housing assignment as I was given what can reasonably be considered as the best room in the entire freshman dorm. I was treated with a lot of respect by coaches, administrators, & faculty at this school with almost 2,500 students.
Like you, I played & was captain of a sport I did not like–soccer. But it was a way to get exercise & to stay out of trouble. Although well qualified, I never considered playing soccer during college either formally or informally. (I still dislike the sport even though I was a skilled & passionate participant when I played soccer.)
Tennis is different. Tennis is a social tool that can be used in a highly selective manner. I did not take up tennis until after college. This was a huge mistake. The relationships built from tennis equal those made in golf.
Had I played tennis in college, I have no doubt that I would have enjoyed the LAC experience. Tennis also is a great way to build intimate relationships at major national universities & in large cities & in professional settings.
Are high school sports worth it ? Yes. High school sports offer much more value to the development of the individual physically & socially & with respect to discipline than you realize at this point of your life.
P.S. Plus, the jackass factor is quite low in the world of tennis compared to other sports.