why I'm I being charged from my account for itunes

You do not say where you see this purchase. If it is an e-mail are you sure it is real and not an attempt to steal your private information ('phishing') (very common)?

Identifying legitimate emails from the iTunes Store - http://support.apple.com/kb/HT2075

Phishing & Other Suspicious Emails - https://www.apple.com/legal/more-resources/phishing/

Forward attempts to: reportphishing@apple.com

If you think the charge is real:

View

View, change, or cancel your subscriptions - https://support.apple.com/HT202039 - "Your membership or subscription might renew if you don't cancel your membership or subscription more than 24 hours before your renewal date." At this stage the renewal is considered a purchase. For a new subscription the sale is probably effective from when you first agree to subscribe. Deleting an app does not cancel the subscription if it has one.

Apple's terms of purchase in the USA are, "All Transactions are final" (https://www.apple.com/legal/internet-services/itunes/us/terms.html), but some countries have different laws so check terms for your country at: http://www.apple.com/legal/internet-services/itunes/. If sales are final then it is Apple's decision if they want to grant a refund. You can always ask, and people do get refunds on a case by case basis, but Apple can also say no.

Get help with an item purchased from the iTunes Store, App Store, Mac App Store, or iBooks Store - https://support.apple.com/HT204084

If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement - https://support.apple.com/HT201382 - "Before you contact Apple to request a refund for a charge you don't recognize..."

Report a Problem - http://reportaproblem.apple.com - "Sign In for help with iTunes purchases made in the last 90 days"

Other ways to contact iTunes Store Support:

https://support.apple.com/contact

https://www.apple.com/emea/support/itunes/contact.html

"iTunes" is the name given to two different applications. Both are free. You are not being charged for them. I am guessing you mean Apple Music which was free for a 3 month trial and then there is an automatic signup (which you can undo) for a subscription. If you are not familiar with this kind of thing then take this as a learning opportunity, it is very common with apps.

If the only indication of the charges is from an email or text, be aware that it may be a phishing attempt to get you to log in to a site that appears to be Apple and divulge your password or credit card information. Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

You can use the following instructions to determine if it is a real charge, what it is for, and to report a problem: Get help with an item purchased from the App Store, iTunes Store, or iBooks Store - Apple Support