Afraid of brain damage at 26 cause of alcohol use

Hi folks, been thinking about this a lot lately, but last few months in patricularly.
Started drinking around 19 and have been until a few weeks ago.
Always have been drinking once a week and sometimes would skip a week.
But lately Ive started to develop sort of health concern mostly about loss of humour, IQ and social abilities.
Is it likely I already have damaged cognitive functions like these things or isnt it too late to fix this.
Also took an MRI for this concern of mine at the start of this year which was positive with no further complications.
just wondering