So by way of a guide to eating at a sustainable level, to maintain your current weight of 134kg, your daily calories would be c 2600 per day, based on no exercise and a fairly sedentary lifestyle.
At 100kg this would be about 2,170 cals per day, again based on sedentary activity levels.
At 90kg this would be about 2050 cals per day (activity as above).
So the idea of showing you this is two fold -
1. Prompt you to think about current intake and maybe for a short while log your daily calorie intake on your '5'
2. Set a bit of expectation of how this would step down over a period of time to land you at 90kg
Given that you're looking to lose something like close to 100lbs, and you'd expect this to take something like a year to 18 months, this also indicates the gradual but steady reduction of daily calories.
Exercise on top will help a bit (never overestimate!) and has lots of other benefits too.