Hi @Lina25964300vp9n,
That is the way the student plan works. Its a low price for the 1st year and beyond that it's increased however, the price still is less than the regular plan. For details you can check the following article
https://www.adobe.com/creativecloud/buy/students.html
Look at the FAQ section at the bottom of the page. I quote the relevant portion here as well.
The Adobe Creative Cloud student discount price of US$19.99/mo lasts for the first year of your membership, and increases to US$29.99/mo for subsequent years. For more information, see the terms and conditions.
Now regarding cancellation fees, that is applicable if you cancel after the free period window of 14 days. Here is what I would suggest. Connect to a support person and discuss your problem, they will be able to find the best possible way out for you.
To contact support, login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
https://helpx.adobe.com/contact.html?rghtup=autoOpen
Type AGENT to avoid bots and talk to a human.
-Manan