In my youth (my stated age is fake, wish I was in my 50s again!! !) I was very competitive academically at school and university later on. My self esteem depended on it then, as my personal worth had been shredded by the way foster children were regarded and treated in the 1940s and even now. So scholastic ability (and music) and a natural ability to swim like the proverbial fish were my "islands of competence" that I had to cling to and build on, like a drowning person clinging to a life raft.
I abandoned the formal study music as a young person in my teens (too much pressure put on me, so intense that I would have cracked up from the relentless demands to play perfectly 24/7) and same for swimming. I was only beaten in the pool once, and found it very hard to cope with (without parental interest or support - they never came to see me swim or to prizegivings, it was completely ignored). So by my late teens, academic prowess was the sole focus of my competitive drive.
Achievement did benefit me in many ways, not least psychologically and emotionally; I had grown up knowing that more than "ordinary" children, who belonged in their families, I had to "prove" my worth. Competition was one of the many things that saved me as a person and an adult. It can be a very positive thing in context.