Girlfriend picks out body wash with a different guy, is this bad?

[Deutscher]

So me and my girlfriend work at a store, we've only been together a month, she's very social and knows everyone, I'm very not social and know a lot of people but a lot of them i don't really talk to.

When I clocked out, i went to where she said she was, i turn the corner and go down the isle and there she is with another guy and he was helping her pick a body wash by smelling them with her. I really didn't like that and i told her about it and she said that stuff doesn't mean anything to her unless she's doing it with me, but either way i did not like that and she said she didn't see anything wrong with it and then i asked her how she'd feel if i was doing that with a different girl while i was waiting on her and she said she wouldn't like it.

Am i overreacting or is this normal or nothing to worry about?
Thanks for the advice/help/answers!! :)

[Vanidal]

"And she said she wouldn't like it."
Then you should demand the same respect if you're going to respect her concern. Don't be a doormat.

[Vanidal]

Oh, and yeah, jealousy is normal. It's up to you what to do with it. It's like lust, or excitement, or any other feeling. Respond according to the situation and what you want from there.

[Deutscher]

Thanks for the advice!