consider this statement:

I have always been a loner, trying to be someone I am not and as I am too soft and empathetic, I get taken advantage of a lot.. spend my Uni years on the net talking to people far away from me to have a 'connection' and thus, blew my degree so it's really a useless piece of paper.

What's the meaning of blew in this statement?

I'm kinda confused. I thought he said he has made connections there on the online university, but he blew his "degree" -- it's his 'degree' that he blew? but at the same time he is saying, by my understanding, he has gotten his degree, but it's just a "useless piece of paper"? I'm very confused.