At age 8 I started TKD, at 13 Kung fu. By your age I was able to kick the bottom of a net on a ten foot rim. Decades ago but…
Fact is all it ever did was look cool.
When military time came at age 18 I quickly realized that in an actual fight the pretty moves are worthless.
So the question I have for you is:
JUST to compete, or do you want something that’s practical in an actual fight?
Best I’ve seen for practical is BJJ.
Any of the rest are good for competing for points. If it’s the competing vs fighting you want, find out what Type has the densest population and most tournaments in your area.
If you want practical go for Brazilian Ju Jitsu.