Why no one chooses me ?!

As the title said, guys like me for fun only. But never choose me for love.

Don’t know what i’m doing wrong ?

I get told a lot that i’m pretty but i can’t judge myself and i don’t see myself that pretty. However nice guys love me and i’m always more calm and quiet if i’m not excited about the person and i’m just into them and when i’m attracted to a guy i tend to show more of my personality which is more outgoing and fun and bold and then these guys would always end up wanting just fun with me.

I’ve noticed the pattern but i don’t know what to do with that. Do i need to change my personality and keep showing the calm side only ? But that’s not the true me, how would i keep going like that forever.

And i’m a person who enjoys sex and would consider it as something important so when i’m attracted to someone i wouldn’t mind sexual topics or even having sex in early dates but then they would consider me “easy”.

What should i do exactly and how to change from the fun the girl they just enjoy with to having someone choosing me forever ?

I love a guy so much but we stopped talking two months ago because of the same situation, he kept approaching me forever and i was the calm personality until i fell for him and opened up more so he had fun with me and then he left and he said he doesn’t want something serious.

I still think about him everyday but i’m trying to move on and found out the same pattern again when i talk to guys on dating apps. There’s this guy that i really like right now, so i don’t want to mess it up and don’t want to open up fully so he does not take me for granted and see me that easy again, but at the same time i can’t pretend when i like someone, so tell me what should i do ?