I have a strange problem. i am an 18-year-old girl. for about four months i have been suffering from an empty state of mind. i cannot think and i cannot form an idea. the situation has worsened. i can't explain anything else because of my mental empt?

Definitely of concern, considering your age and the fact that transition to college is a very stressful period in life in general. Best would be to start with your pediatrician who should be able to connect you with local services as needed, if using any recreational substances, such as marijuana or electronic cigarettes stop until further advised.

It is not feasible to provide an opinion without additional history, physical examination may be some tests. It would be prudent to see your doctor to see if you may be depressed. Depression is treatable. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!