Fact: I had to counsel a 9-year-old to lay off for a few weeks because she was developing tendinitis as a result of tension and misuse of her 4th finger.
Fact: I began dealing with tension-induced injuries around age 12. My current ability to play comes courtesy of luck, surgery, yoga, miles of KinesioTape, ibuprofen, vigilance, and a complete rework of my technique requiring me to pause my professional career nearly a decade ago. Because of this, I am much more susceptible to the kind of injury that requires time away from the cello. I am constantly in defensive mode to prevent this.
Fact: Tension is crap technique.
You are not an exception. You are the rules that you play by. Choose wisely.