I want to cancel but they want to charge me for the year.

>chose the monthly subscription, so I thought

There are 3 payment options... monthly, annual paid monthly, and annual prepaid... you bought annual paid monthly

You had 14 days grace period in which to cancel without penalty & receive a refund. 

Did you cancel in time?

===============
How do I Cancel my Subscription?
https://helpx.adobe.com/manage-account/using/cancel-subscription.html
===============
Subscription & Cancellation Terms:
https://www.adobe.com/legal/subscription-terms.html

CONTACT ADOBE CUSTOMER CARE:
================
Online Chat: https://helpx.adobe.com/contact.html?rghtup=autoOpen
X (formerly Twitter): https://x.com/adobecare

Hope that helps.

make sure you're aware of the cancellation terms by selecting your plan type (at the top of the page here), https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html

for info on how to cancel your subscription, this page describes the few steps involved, https://helpx.adobe.com/manage-account/using/cancel-subscription.html

if you want to cancel but are unable to follow the steps described in the "how to cancel page", contact adobe support.

there are 2 ways to contact adobe; chat and twitter (now x):

chat:
use a browser that allows popups and cookies, and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human.

twitter/x:
tweet @AdobeCare

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.