Hello Friend, Good that you are seeking a help here. Yes, your symptoms are showing a sign of depression and anxiety. When your mind is pre occupied and clogged with such negative and worrying thoughts, obviously you in control of your present environmental. Loneliness, lack of interest, concentration, social anxiety, Mood swings, crying spells etc exhibit automatically in your emotions and behaviors. So having experienced such disturbances affecting your day-to-day life life, why don't you take the next logical step to address it by taking a professional help. Yes, by ventilating your emotions, feelings and concerns with an psychology experts, you will be able identify and isolate the root cause for all these emotions stress and also a suitable solution to overcome this problem.

Yes It seems to be major depressive disorder Seek psychotherapy and medication

Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. Consult a Psychiatrist for a detailed assessment. It is likely with medication and counseling the symptoms will improve. If you are feeling suicidal or hopeless consult a Psychiatrist immediately.

Probably... It would be better to consult a psychologist for more understanding.

First assess urself by me or any other competent psychiatrist after that we can sure about diagnosis n then treatment