My memory is really weak i forget more than others and its notable by me and others too, i forget names, events and faces etc all kinds of memories i forget more than usual, my age is 20 i hope its not dementia or any related desease, please help!?

If you,your family or friends have concerns about your memory, it definitely warrants an evaluation by a neurologist, psychologist or psychiatrist to check for cognitive loss. Appropriate testing will be performed.

This could be secondary to congenital or developmental problems, even a learning disorder, but also medication reactions, lack of sleep, depression, etc. Evaluation by a speech therapist is a good starting point, but a neuropsychological test may also help.