Well having no patience and being raised up by a family with no patience i ended up never learning to ride a bike. I actually tried when i was a teen to teach myself and that ended horrible i guess i have no balance lol.
you should look into that, maybe you have a problem in your ear or your brain preventing you from having balance. i'm sorry you can't ride a bike, its in my top 5 favorite things to do. I hope you find a way to learn it, good luck.