Thongs

Soo im 15 and i have never worn a thong because my mom and i never talk about stuff like that she never gave me “the talk” or told me abt periods or anything but i have been wanting to get some thongs because there cute yk but also i want them for volleyball so when i wear spandex my underwear lines don’t show but my mom is kind of against it so how should i get them should i convince her or just buy them and tell her later and if you have any tips on this it would be really helpful