Depression. Right now condition to you.

I am 24 year old and always worried and scared. Also feeling very lazy and low not interested in anything. Not able to speak to people easily. Always taking stress for things like driving,job and what people think for me. I am very skinny may be that's one of the reason. But always thinking negative and not able to share anybody my problems. Now I am also feeling erection and sex desire issues. Which makes my condition worse. Wrong thoughts are coming my mind which provoke me to take wrong steps in order to harm my self.please let me know how can I get rid of that condition. Any medication or any advise.I am working in night shifts because of my financial condition is not that good. Hope it will clear my right now condition to you.