But what's it about for 135? It sounds like you have this magic number in your head. I've set goals for myself based on both my BMI and my weight in the past. For example, my first major goal is to be 179, out of the "obese" range. Then it's 160, which I weighed when I started college, and then 135 which I weighed my sophomore year in high school. If I can't get there, it's not a huge deal, just that I'm under 149, which is considered normal weight according to my BMI. I would like to be 125-120, but I'm not focusing on it. It's not my overall goal.
Believe me, it can get frustrating, but I've never been to your point where I'm close. For me, I'll lose 5 lbs and then gain it back almost instantly if I splurge too much on food for one day. It's extremely frustrating and I've been at 209-207 for days and days and days. I gained MORE, went up to 213 (!!!) after a weekend where I honestly didn't overindulge that much (so I really don't know why I gained 4 lbs). But now I've been working out so I'm losing again, as well as eating very well.
I think your friends and family just don't understand why you want to be at 135. If you look great at 149, why not shoot for 145? I understand about 135 being in the middle of normal weight for your BMI, but I think you should just shoot for 149 right now, and once you get there, see how you look and if you're happy with your weight, don't lose any more. My best advice is to get this 135 out of your head, and focus on 149, and then once you get there, see if you want to or need to lose any more.
Good luck! You've made it this far, don't stop! It sucks so much to gain back after you've lost (I got to 195 last summer and would give anything to be back there).