i fall upon the thorns of life i bleed

paraphrase

I think it means to go through a lot of obstacles but fail

Has the speaker failed yet? The obstacles/thorns you have right. That they bruise/make him or her bleed, yes. Life can be hard, but has the speaker failed? I don't know. Think about it.

Here's an interesting interpretation:

http://www.enotes.com/homework-help/can-have-an-explanation-following-lines-oh-lift-me-107773

To paraphrase the phrase "I fall upon the thorns of life I bleed," it could be expressed as "I encounter and suffer from the challenges and difficulties of life."