Hello Hana, It's Okay, the journey of a thousand miles starts with a step, you should face problems in your way for success, good achievements would not come easily, if you have the intention to learn English and to excel in it you must study hard, read more articles in English, tackle grammar issue step by step, this exactly what happened to me while I was still young, I've faced problems with grammar too, but by insisting and breaking down any problem I had overcame all this trouble. Listen and read more and more, all your problems will be solved by time if you are determined to succeed. Send me any question you might have in grammar, I'll be ready to explain it for you. My best wishes