Logan123987
No need for nasty answers, we have all been there, and many of us did not have access to such resources as we have today.
As you know at the moment there is nothing happening, but of course this will change in time, how long is hard for anyone to predict. But you should not need to worry about this at this stage in your life, as you have many years still to get into the business. Air Force as someone mentioned is of course a great way to get going, and probably the only place where you can get fully sponsored training.
As for the others, depends where you are eligible to work, if you are British, you can probably discard all except BA and Virgin, as with Brexit coming soon, you won't be eligible to work for any of the others. And I believe Singapore have very strict residency rules, and unless you have Singaporean residency, you are very unlikely to get offer from them.
You don't give enough information of yourself to give much more advice on this. However I would stay away from Virgin, if they at all survive this pandemic, and BA is not necessarily the great all in life, so maybe avoid narrowing down your choices to large national careers only, as there are many other goods jobs out there too.
I would recommend, look into local flying clubs, when you are old enough maybe try to take a few flying lessons, even try to take your PPL and see if you still enjoy it, and slowly build your career that way. You can find work to finance much of this training, and avoiding putting yourself into massive debts with large training companies. Stay away from integrated courses from L3 and Oxford, as they are just money grabbing machines, and they can't give you anything that you can't get somewhere else for half the price.
Besides that, good luck, and stay focused, do good in school and if you can take a degree before flying that is great, as you never know what might happen, and it's good to have something to fall back on if there is another crisis, loss of medical etc.