Mood variations. I am 22 please help me!

I understand your situation. You seem to be suffering from few depressive symptoms including being irritable and even more sensitive, may be due to personality issues. However more information regarding your sleep, hunger, energy levels and concentration at whatever you do would be helpful to decide the severity of your condition. If suicidal please seek immediate professional assistance. It is easily manageable with appropriate treatment. Some therapy 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.