When I was younger I had a lot of insecurity about my weight, mostly from family calling me fat so often (it wasn't meant to be emotionally abusive or malicious, just a cultural norm in Chinese families, remarking on your weight is pretty standard).
Then I got to college and joined a martial arts club and started to compete, which included weigh ins regularly since we were divided by weight class in competitions. I got over my weight/scale insecurities really fast, lol. I stopped caring about my exact weight, and cared more about performance and training. On the rare occasion I went over my weight class, I learned it wasn't a personal failing, and my team helped me get in under the line in time. I was proud of what my body could do, not how much it weighed. Also, being around athletes basically chucks your sense of BMI out the window.
Ever since then, I've been 5'4 and a size 4/6 at 150lbs. I get compliments about how I look and so I don't sweat that my BMI technically makes me overweight lol. In fact, I share my weight freely with my female friends when they're feeling self conscious because of a scale number, because I weight more than they do most of the time, lol. And it's empowering for me to be proud of my body, like "yeah, that's right!". Sure, some days are "bad" days where I feel like a whale, but when I really think about it, it has less to do with being bloated or weight a little more, and more to do with feeling like I was lazy that day or didn't accomplish anything.
Honestly, feeling good fro me has more to do with my pride in my profession, my personality, and my relationships, none of which are affected my weight. So even if I weighed 250lbs, I'd still be me, my friends would still love me, I"d still rock my job, and be admired among my colleagues lol. And how much I weigh is under my control, it's not a permanent state of being, if it really bothers me that much, I'm sure I could be a size 0 with some extreme measures. But I'd rather be a happy size 6 than a hangry size 0 (because my body would not be happy to get there, lol).