Its still bothering me

The other day, my girlfriend and I were talking about her upcoming trip to Australia to meet her friends as it was on of their birthdays. then she asked me a single question that made me feel like shit, " what if she wants to go clubbing on her birthday? i thought you dont allow." that single sentence made me feel like shit beyond bounds. i never said i didnt allow her to do anything that she wanted. she just assumed this because i guess you could say im a bit "insecure", if you will, about my girls. i dont know. im just not used to all these somewhat normally meaningless gestures. i have a feeling that im uncomfortable with these gestures because i dont normally do them and i dont know, they seem to hold a certain value to me. these gestures are things i would normally only think of doing with my girlfriend, and when i see other guys doing it to my girl, like putting their hand around their shoulder for example, it annoys the hell out of me. i dont know why, but it just does. i dont want it to but what can i do? its not like i want it to. i would love it if it didnt. whats more is that she doesnt know how to react to such situations so then she just lets the person continue doing it, and it doesnt inspire much confidence in me. i know she will never cheat on me, and i do trust her. but either way, it still will annoy me. and with that, thats how she came to the conclusion that i didnt allow her to go clubbing. and even though that comment was made quite a few days ago, its still bugging me and i feel like a horrible controlling boyfriend, but thats not what i had meant to do. this sucks, and i feel horrible and lost as to what to do now. maybe im not cut out for this, and maybe she deserves someone better whos more open to these kinds of things, but i dont even want to think about that