I'm going to give my two friends who are girls souvenirs from my trip even though my girlfriend disapproves of it
Why does your girlfriend not approve?
She said they are not my friends
You shouldn't give other girls gifts if it makes your girlfriend uncomfortable. Maybe you can save the gifts for your girlfriend instead? It might cause tension in your relationship if you don't.
You are right.
That's a wise choice. Making your girlfriend needlessly angry is foolish.