I need help finding my true bra size and I don't think what I calculated was correct

I do believe I am still growing. When my mother first introduced me to bras with actual sizes, not just Target bras, she gave me a 32DD which sort of fit. I wore that bra for a good year after that. Now, the bra doesn't fit too well, as its getting worn out and the band is a little over stretched. I recently got measured at VS and was told I was a 30 with some cup size I don't remember. I tried it on and it didn't fit, so I requested once again a 32DD and just stuck with it. The center of the bra doesn't touch my chest and pressing it down to sit flush against my skin makes my chest essentially squish against the material. I decided to measure myself and use the calculator, coming up with 28F and it didn't seem right (looking at regular photos of other women with the same size.) to me. I am a small person, standing at around 5' and a tad bit under weight at maybe 90+/- lbs. I've never seen myself as someone with big boobs, but the issues I have with finding a bra that actually fits me properly is getting annoying! I really just need someone else's words here. And no, asking my mother is not an option, we are on bad terms (arguing and crying over a phone call) and I haven't seen her in a few months. Please help me out here!! <3