If i excersise MORE will my body go into starvation mode?

You need to eat about 1300 calories per day to lost 2lbs per week. If you want to maintain, you should eat about 1600 - 1700. So, if you want to lose weight, and you're burning 300 calories per day, you will stick to 1300 net, which would mean you would actually eat 1600 calories because you need to eat what you burn since you're already intaking few enough calories to lose weight with diet alone.