Sorry OP - I suspect this thread is quite a wake up call for you. I am your same height and have been the same weight (and a stone more at my heaviest) and it was definitely obese.
To put it into a bit of perspective for you 12.5stone is 189lbs. That's 11lbs (just shy of 1 stone) less that 200lbs. At 5'4 no one should be weighing nearly 200lbs!
You likely don't notice how big you've got because the weight has crept up and like people have explained vanity sizing has really skewed our perceptions of ourself. When I was your size (I'm an hour glass shape for reference) I was a size 16-18. That was 6-7ish years ago before the oversized trend had kicked off. Now clothes are so massive that I struggle to find anything that actually fits me.
At my highest I was 209lbs after just having my first baby. That's almost 15 stone. I was wearing a size 20-22. I lost a load of weight and got down to 10.3 stone (145lbs) and while I did feel so much better about. Shelf I was still fat. Unfortunately I wasn't able to lose any more weight because I got pregnant again. I was much more careful with my weight during my 2nd pregnancy and only put on 24lbs. That was a few years ago.
I now weigh 8.3 stone (116lbs) and feel so much better and my confidence is miles better than what it was when I was big. At 8.3 stone I still feel a bit fat but that's mainly due to flabby excess skin I now have to carry around with me as a painful reminder of how fat I let myself get. If the skin and flab that I can't lose through diet was gone I would likely weigh 7.6 stone which I would consider to be a normal healthy weight for my height. I now wear a size 8, but the oversized cuts and vanity sizing of clothes means that they are often so big I can't fit into them (some stores don't stock anything less than an 8) or as was the case recently I had to purchase an XXS from Mango. I have never seen an XXS item of clothing in a U.K. adult shop until this year. It's not because people are getting smaller, but because the clothes are getting bigger in the size we used to buy, so they have to now introduce even smaller sizes to get us back to the sizes we had before.
Have you even gone into a museum and seen clothes from 100yrs or more prior? They're TINY! Only a small fraction of people these days would fit into them (and no it's not all because we've all become taller). 5'4 is and was always a very common height, but I would struggle to find someone at 5'4 now that's older than 20 who could fit into a woman's dress from the 1800-1900's.
Anyways, I hope this thread hasn't upset you too much, but hopefully given you a gentle push into the right direction for 2023 