Hello Doc.i Just Find Out That There Is An Online

hello Doc.i just find out that there is an online for medical advice. anyway, i have a problem regarding my memory. i am 22 years old but i don't know why i easily forget things like if someone tells me something, i easily cannot get what he/she is talking about which is not normal for my age. Can you help my problems regarding with this?
i actually search it in the google about it and it exactly tell about the symptoms of Alzheimer but i dont like to believe it. please help me how to combat it.