My partner is threatening to leave me over something on my bucket list?

i am 22 male with a girlfriend F24 and i’ve been wanting to go streaking as it’s something on my bucket list however she is threatening to leave me over it as she doesn’t agree with it and is embarrassed. i’ve told her that it’s something i’ve always wanted to do and she should give me a valid reason why i shouldn’t, the only reason she has given me is she’s too embarrassed at the idea of other people or her friends seeing my penis as how she puts it i have a small willy. i think she’s just saying this as a excuse.

im just asking for help or input on what you’d do in this situation as me or her.

thank you

Updates
+1 y
also just for context i don’t believe i have a small dick i think it’s her saying it to try and make sure i don’t do it
My partner is threatening to leave me over something on my bucket list?
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