I always feel like I am lonely. My mind.

You are going through emotional imbalance that needs attention and take some appropriate steps. Seek help of a Counselling Psychologist. You have a long way to go in life. Lots to do and achieve and also enjoy your life. It is not worth worrying and doing nothing.  You have to take the first step forward.

I understand your distressful situation. You seem to be suffering from few depressive symptoms. However more clarity is needed regarding your problem. Information regarding your energy levels, interests and concentration at whatever you do would be more helpful to decide on the severity of your condition. Your personality traits need to be evaluated in detail as well. If suicidal you should seek immediate psychiatric assistance. Don't worry it is not your fault, it is the hormonal and chemical fluctuations in your brain which is taking a toll on your mental health. It is easily manageable with appropriate treatment, so that dysfunction due to the same can be reduced and your quality of life will improve. Some counselling sessions and if needed medical help might be useful for you. I would also be more than happy to help you with that if you are looking for online assistance. Discussions will be held confidential. You can directly consult with me through Practo as needed. Online chat consultation is available.