I need help😣

So I am 17, 5”2 and I am 12 st 9lbs!! I am very over weight and I do want to loose weight but I have a tendency to give up and let things slip and then just go back to normal! I tend to eat when I’m bored and juts as it’s there! I am juts not motivated and don’t seem to have the ability to be motivated to change! When I do it doesn’t last very long at all as there is more temptation for me to eat unhealthy and Lots! I used to be extremely skinny a few years ago and I want to be 8/9 stone instead of what I currently am! I need everyone’s tips, tricks and advice! I’ve tried apps but I forget to update them as I have a very busy lifestyle and very stressful too. Please help me....