I'm unsure of the actual underwire fit, not sure of it's too high under the arms or too narrow and not sure about strap placement

At 1st, I thought this bra's cups were too small and maybe they are. I think I just realised that I wasn't lining the wire up close enough to the breasts crease to actually cup and lift them and with the band being too loose I feel like my support is lacking. I'm not sure if the cup is actually too small or not... I feel as though my nipples are being folded and smushed into the bra or part of the breasts are getting smushed, I'm not sure if it's just because this is my first unlined bra and I've got to get used to setting them in there properly or if it's actually too small/ wrong style bra for me...