What will it really make a difference?

I am 17 and am reasonably happy with my body. Well I’m fine with how it looks in clothes. I used to hate either my stomach, thighs or bum at some point or another for ages, but I’ve had an amazing boyfriend for the past 15 months and he genuinely loves every part of me and therefore I am comfortable in my body and accepting of it. I am about 5’ 4’’ and just under 9 stone. I have always been a stone or half a stone heavier than most of my friends. I don’t look overweight, and yes I am slim but it’s just a thing that’s always bothered me. I haven’t gone swimming since I was 12 because of my self consciousness about my body unclothed. I wear tights with skirts and shorts…well that’s more to do with my strict mother! I don’t really do any exercise anymore and am unfit. I know people say “exercise” and eat well, but I’m a poorly motivated person and give up easily, also I’m a bad time manager so it never works out. My mom is big boned,well not manly like! but she’s always been a UK size 16 or 18 and my Dad isn’t slim, with a beer belly. My sister and I have inherited my mom’s larger ribcage,but it isn’t that noticeable. The last weight I remember being stable at for a while was 8 stone at around 12/13. Also I was kinda chubby as a child and love food.I’ve been wearing a UK size 8-10 since I was 13. Basically, I don’t mind my size, I’ve accepted it now, but I have quite strong muscles underneath my excess fat on my stomach and thighs…and I would like to look and be more toned. So I plan on losing half a stone, bringing me to 8.5 stone. Will I look that drastically different? I mean will I loose my curves? I also have a baby face…it’s only 7lbs but will it make that much of a physical difference because of my stature?