You can definitely do it. What I said to the people above is very reasonable.
As long as you love it, you are not afraid of difficulties. As long as you are persistent, you can achieve your goals. You need to have a good dance partner and ask a famous teacher to guide you based on your own foundation, and you will definitely be able to achieve great results.
With the purpose of exercising and the motivation to participate in various levels of competition, you will definitely succeed.
The ballroom dance competition is divided into age groups. It is also divided into modern and Latin, you must choose which one you like. The Latin and Waltz you mentioned above are two different dance categories. (These two categories include many dances) you can only choose one category.
I wish you early success!