Anyone with a brain (and that includes you) can memorize things. Maybe it will take awhile, but you can do it. Buy or borrow a set of flash cards for multiplying single digits. Those cards were designed for precisely this purpose, and they've helped millions of students memorize the times tables. If you have to go through the stack of cards a thousand times, so be it. That's better than trying to get through school without memorizing the tables, which would make school much more miserable for you.