this is my first poem..is it good?

I like it, but I also feel like the three stanzas don't have the similarities you were trying to make them have. What I mean is, tears, happiness, and meaningless don't exactly fit into the same category. It's really good though, I just think it needs a little work (:

I guess you have summed up life into three aspects. Sadness, happiness, meaningless(ness)?

Now, think. Are there more cognitive states?

It's a good start, but you should really try to capture more of the picture. You did a good job, but I think that you should try adding for details or revising details.

ya, it's good.