Have you ever been able to watch your side of convo since your purchase? Do you text with the original text application or the hangout app?
The best option would be for you to take a screenshot of your phone, to show us a concrete exemple of the problem.
To take a screenshot from your phone, press the power button and the Home button simultaneously for about two seconds.
(If you have difficulties, you can find an example here: http://androidfact.com/how-to-screens...)