I'm using Tor browser in incognito mode
first off "incognito mode" just doesnt save the history on your physical pc/device. it does nothing else.
secondly majority of the tor exit nodes in the tor network are run by the government. (the exit node is the last stop in tor, its where all your traffic will go through, and thus by running an exit node you have access to all the data regardless of what route it takes. and its also what submits your data to the server you are connecting to, so it will be unencrypted at that point).
So using tor is worse for your FAR worse privacy then not using anything at all :/
So if you are doing something illegal, using tor is literally the worst possible option you can take...
Your best bet is to use a good (paid, never use free ones) VPN. Make sure they keep NO LOGS at all (so if anyone asks for logs they cant turn them over since they dont keep them).
Even with a VPN, im not so sure i would trust it for the purpose of doing anything considered illegal. (being truly anonymous, is something that takes time, and lots of money and intelligence).
And being 17 years old, i dont think means much of anything. They have charged 12 year olds as adults for crimes before