being waste of space

Today somebody politely told me:
                                YOU ARE WASTE OF SPACE
no good results from your applications, no work this year, no studying for konkur and blah blah blah.

It all started after I called somewhere to find a job as a c programmer, the guy told me are you familiar with object oriented in c++, I said I dont work much with oos in c but I am familiar with the concept I wrote many programs in java and used oos. (actually the guy didnt let me to say all this). We need an expert miss, suddenly he said. and I said bye.
after this call the somebody I mentioned above became angry of me and told the line 2 and 3 rapidly.
I went to bath, and start crying. I came out, sleep and right after I wake up I found some amount of water in my eyes.
In bath I came to a conclusion: there is not anything I should be sad about, I feel my great god right behind myself. ;) also I found out that I am more beautiful when I cry :P

All in all, having the feeling that you are waste of space is awful. actually today I didnt have this but once I asked one of the professors to give me recom I felt it.