annulation subscription

Hi Adobe,

In in 2019 I started my Photoshop subscription of 12 euros each month to make a schoolassignment. After I signed in and payed it was clear my computer could not open the program because it was not strong enough, so I tried to cancel. It became clear my subscription was supposed to be payed for a year otherwise it could cost me a lot at once. So I decided to keep paying the monthly price until a year has passed.

Now we are almost 1,5 year further and still I have to pay a huge amount when I try to stop my subscription. Why is that? and what can I do? It feels very strange to pay each month of my studentmoney to something I've never used. I am just not able to pay around 50 euros in one payment to stop the subscription. 

Thank you