What are the opiton of bras or other options that are not bra but used instead?

I am 23 years woman. Always has struggled with finding bras and don't really like them and don't like to wear a bra. I don't know my size. I think my breasts are on the small size. I don't like showing my nipple. There are other options to try instead of a bra. Getting fed up. My mum said they no other option.
What are the opiton of bras or other options that are not bra but used instead?
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