I would recommend that you go to see your primary care doctor
about this problem. This sounds like a pretty typical ear complaint, and they should be able to help you out.
There are at least two common causes of the symptoms you are describing. The first is otitis externa, which is an infection of the outer ear canal. In addition to itching, there may be discharge or odor from the ear. There also may be pain and redness of the ear canal. Otitis externa can be easily diagnosed by your doctor when they examine the inside of your ear canal with an otoscope. If you do end up being diagnosed with this condition, it is typically easy to treat with antibiotic ear drops.
The second common cause would be filling
up of the ear canal with too much ear wax. This can create an uncomfortable pressure sensation or lead to trouble hearing. However, in other cases, it might just cause itching. This problem, again, can be diagnosed by your primary care doctor when they look in your ear. If you end up having too much wax, your doctor may decide to clean out the ear with either a small ear cleaning tool or with a liquid solution.