You would be able to see if you were taxed on your pay cheques by looking at box 22 of your T4 information slip received from your employer.
Since you are under 25 you can do your taxes for $15 or less.
For information please see our TurboTax article: Tax Guide for First-Time Income Tax Filers.
For more information please see our TurboTax video: Tax Basics: How To Do Your Taxes
Thank you for choosing TurboTax.