My advice, read the story of the tortoise and the hare.
I didn't start until I was in my late 20s, I had to get a good career established before I could afford to fly. Won a flying scholarship which helped a lot.
I've been instructing for nearly 30 years and all the people who have "made it" have been the steady reliable plodders, and all the "hares" who thought they could find short cuts and beat the plodders have vanished without trace. Thank goodness as most of them had a horrible attitude and pushy parents
There is no rush! Don't put all your eggs in the aviation basket, at your age you should be focusing on getting the best school results that you can so you can have more choices later...uni, military, airlines, trade, all of the above, whatever.