Whilst it seems fairly easy to write rhyming couplets there is an art to doing it in such a way as to make the lines flow naturally so that they 'trip off the tongue' when you read them. Some of your couplets are a little forced (a fault I also suffer from!) which interrupts the flow of your poem.
However, in saying that, there is enough content to provoke thought, which is no bad thing. Well done!
This poem was very honest. The ending could be finished, it depends on how you look at it, either as an open ending leaving the reader to finish and fill in the blanks, or an unfinished ending. Very true poem though.