Search Results: warning signs

So my girlfriend is a bit younger than me (21 years old) and has always been interested in the way she looks, and using her looks to gain social media following. She has 10k+ followers on Instagram, and regularly gets compliments, private messages and friend requests from thirsty guys in her home town.

My issue is not that she's using social media to post pretty pictures (modelling, stylish, sexy etc) but it feels like a warning-sign that she's still, while in a long-term relationship with me, posting the kind of attention-seeking selfies (pouting lips, only selfie, posing body-pictures etc.) on Snapchat/Instagram/Facebook (and stories - which are seen by all those hungry guys) and defending her social media usage from all criticism and jealousy. I just feel like she's fishing for attention and it's bothering me that she doesn't listen to my concerns.

MY QUESTION: Is this a behaviour that's so normal for girls these days that I should just write it off as an age-related behaviour, or do I have any justification in feeling like it's not very girlfriend-like behaviour and a legit red flag?

Would love to hear if someone "is" this girl/what you think, or if someone has found a nice way to overcome the feeling of weirdness together with their partner. Advice much appreciated!

I'm not joking. This is real news. I was reading a book about world war 1 and after turning on tv i saw this news. Similar incidents happened before World War 1. also bc they are having drill in Indian Ocean, it is indirect warning to China as all three of these countries are against China. What do you think about it?