Could it be that your beliefs about yourself as a learner affect your motivation? Where do these beliefs come from? Could it be that you have depended too much on external judgments of your skills? Or that in a different learning context you might be more successful? Try to look at your beliefs and understand where they come from. A fresh start or a new way of learning might have altogether different results. Take control of your own learning, bring in your own passions and interests in life and make learning fun.