Hi and welcome! You can lose that last 15 lbs girl and we will be here to support you! I think we all don't have an exact perception of what we look like, sometimes good and sometimes bad. Sometimes we pick apart things that to other people, is very unnoticeable and not worth stressing over.
On the other hand, a lot of women (myself included) have said they did not feel like they were/looked as big as they really are/were. I knew I was big and at least 300 and knew I had a big tummy but never really thought I looked that big. Once I started seeing full body pics of myself and pictures where I popped up in the background, it was an eye opener.
So really, I rely on pictures before a mirror. So that's just my thoughts. Anyways you're gonna lose that 15 lbs and rock that bikini!