Is it possible for me to lose weight without joining a gym? I am 5'7" and am 107 kg.

Of course, it’s possible. You will have to target your nutrition in a big way. So, get on to a sensible eating plan. Next, increase your daily activity. Make sure you do 10,000 steps a day. Do both cardio and strength training. Cardio can be achieved with brisk walks or dancing to begin with. For strength training, try  assisted- body weight exercises, such as wall push-ups and squats against a wall. Bring in interval training to burn fat by brisk walking  for a few minutes and then reducing the pace for a few to recover. Later, switch between jogging and walking. Don’t get restless, just stick to your diet and exercise.