I’ll never be used to people using my stuff

The other day I (25F) was showing my girlfriend and bracelet I made that I was really proud of. I think she thought that I was giving it to her and so she took it and put it on her wrist and when I subtly tried to take it back she was like no I want it. I was like unreasonably upset about it but I never mentioned it to her. I know I shouldn’t be upset because it literally took $5 and 20 minutes of my time to make and she often buys me gifts but my first instinct as someone raised as an only child was to get upset at someone taking my stuff which I thought was interesting.