Is this poem any good?

I think it is very good. If this is your way of venting and getting things out, then keep it up. Write, then read your work aloud or have someone read it to you, that way you can hear the little things that need to be tweaked. The visuals with the lightning/light are very good. I would suggest changing the lower case I to an upper case though. Always use an upper case, not only is that the proper way it is done, that shows your self-esteem. You are a valuable person, always know that, show that with the upper case I. With a lot of practice, and dedication you can become a writer of poetry if you like. This is a nice, if a slightly sad poem. Thanks for sharing.