I've just tried to do a demo talk (basically talking to myself like schizo person

) where I introduce more serious topic like commitment and LTR, instead of the usual day to day ramble, and it felt very very terrible.
Especially questions like: have you ever though of something more serious going on between us.
It felt very unattractive, wussy like, very weak, and non normal accompanied with a bit tension and anxiety.
Haven't felt like that since I was 15 when I told the school girl that I liked her and if she wants to be exclusive - she of course LJBF-ed me back then.
Since then every-time I try to speak about LTR, commitment and stuff like those I feel like I'm shooting myself in the foot big time.
And actually I never did since then (14+ years) I've been with many girls, but haven't got a relationship more than 3 months.
Its like that because usually when I invest a bit more time (communicating and maintaining contact with the girl) - some feelings start to emerge and then something happens that turns her off.
I'll do this demo talk few more times and will try to find a way to be cool and fun and lighthearted and at the same time speak about that serious topic.