Do I have elastic nipples? Wrong flange size? Please help lo

Which flange size fits me better? 13mm or 15 mm

Elastic nipples or wrong flange size?

Flange sizing

Help! Is this flange too big or too small or just right?

Can someone help me with flange size? I felt like 17mm was rubbing

Is my flange size too big or too small?

Am I using the correct flange?

Correct flange size?

Proper flange size ? Please help me..

Help!! Flange sizing? I can’t figure it out (NSFW) nip pic

Flange fit