Green tea will not help you lose weight. Reducing your food intake and increasing your calorie output through exercise might. If you are just drinking green tea and making no other changes you will not lose weight.
As adalind said, green tea alone will not help you lose weight. As part of calorie reduction / control it can help - in the sense that drinking green tea is better than drinking sugary drinks or lattes or whatever.
A really, really good green tea will give you a boost and help digestion. But you need the proper stuff - matcha. Don't bother with twinings or pukka or any of that crap. Get some high grade matcha (look on Amazon) and mix 1/4 tsp with a mug of hot water. It doesn't have the nasty bitterness of the cheap brands.
Thanks all for your replies and valued inuts. I decided to start with some Zumba exercise sessions to burn some calories. I hope it works! I really want to loose some weight now. I will not depend entirely on green tea anymore.