Depression or repetitive sadness.

I have been going through low confidence & self esteem for a long time. I am a graphic designer/artist pursuing masters. I am very empathetic towards other but I do not share my thoughts with anyone. I have a tendency to make things very formal or serious when it comes to meeting new people especially in office where I am an intern. Offices have been a big trouble for me everytime because I never know what to speak, how to have fun or how to not overanalyze things. I always end up being the silent one whom people talk to be just social and then there is an awkward silence. I am a workaholic too and have very high dreams for myself. I want to be recognized but end up being alone. I act very independent and helpful though I just enjoy being alone. I end up crying every now and then because of no reason and I am unable to share of explain my situation to anyone despite Many attempts. I leave it halfway thinking there is no point in saying or doing anything.