Ashamed

I feel ashamed lately.
Thursday is my convocation and I am dreading many aspects of it. I will be asked my classmates if I have a job in my field and all that - and I do not. My job doesn't even come close to my field and I am so ashamed. Almost all of the students who graduated with me in December have jobs - proper jobs and I do not. I am not really sure why I haven't gotten one yet - I have looked as hard as I could and only gotten a couple interviews so far - most for jobs that didn't even exist and the companies just wanted to talk to me.
I don't know what to say - I don't know what to do.
I just feel so stupid, useless and professionally undesirable.
I feel so ashamed.