Hi Tunak,
I have watched all your videos in order to get an idea: first and foremost, I think you are very pretty and feminine. Secondly, I think your voice is fine the way it is in your first videos. I hear and see a girl when I watch those videos of you.
Now, the last one, on the other hand: I have to be brutally honest and I hope I am not offending you, but you do not sound natural, and I no longer hear a girl, now... Rather, something else with a strange voice.
Have you thought about just using your natural voice and being yourself? You are 100% a girl! Pretty cute,m at that! :-)
I hope this helps and I have not offended you.
Andrea