I think that your goal is very realistic and perfectly acceptable. My only recommendation is that to remember that it is only a goal... Until you get close to it, you won't know how your body will feel. ("Weight" is kind of a funny thing.)
I lost many pounds (around 40) a few years ago and kept it off for about 3 years. I am 5'1" and maintained my weight at about 108-112lbs. depending on the time of month. I was at the gym 4-6 days a week and lifting weights every visit (so I had put on a great deal of muscle). I felt amazing and strong - at 30 years old, I was in the very best shape of my life! I have to say, that I hardly stepped on the scale anymore after that because I let my clothes determine if I was eating too much (then I would cut back a little - or go for a workout). I had initially wanted to get down to 100lbs. - but with all that muscle (I was between a size 2-4) I found that I was heavier than my goal - but I felt GREAT!! I guess what I am trying to say is that "weight" is not everything... Get to where you feel healthy, and you can try on new clothes and feel good in them...
After keeping the weight off for about 3 years, I gained back most of it in just a few months after a severe back injury kept me from the gym (and I got sooooo depressed) and started eating to make myself feel better) which is why I am here. I am now looking forward to getting back to where I was before - one day at a time - one workout at a time. Best of luck to you and don't worry about what your friends say, they want you to stay "one of them". Be strong - do what is right for you!!
Good luck!!
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