Uk taxes

[KDAF]

Hi ,

So, I live in the UK (London) and I have a shopify store that I recently set up , I'm 16 years old  but I have my mums Bank details in the account so her card is getting the payouts, Do I need to pay any tax on the money I earn as of now and what happens if I don't?

I do also plan on selling internationally which just complicates it even more.

Thank you