Hello Shabnam
If you find you give up things very easily, set yourself very small tasks at first that will be easy to accomplish.
If you have an English text book, for instance, study it for 15 minutes a day, very early in the morning, and then revise the same part of the book again at night, before you go to bed. If there's anything you don't understand, post your questions here.
Then perhaps when the 15 minutes has become a habit, you may find you're ready to expand it to 30 minutes, then 60, etc.
All the best,
MrP