Both commenters have parsed the specific words you asked about, but neither has captured the nuance of the whole sentence: No one had noticed him or paid any attention him, but he wishes that they had.

Haha... He's saying he's glad to be a problem because he's interesting. In his mind being a problem it's better than being boring

The sentence is valid, though the thought it presents is unusual. Normally, it is not considered to be a good thing when other people consider you to be a "problem". This speaker, however, says that it would have pleased him if people had considered him to be a problem. He explains why he feels that way. He says the reason is that problems, even they are bad, are at least "interesting". He wants to be considered interesting.