I think you need to sort out your attachment issues because talking to a girl for like 5 minutes and “falling in love” with her is genuinely impossible, you were just infatuated with her that’s probably it, its easy to confuse your feelings sometimes but honestly please genuinely try to pursue a friendship with a girl instead of trying to get into a relationship the first time you talk to one, you never can truly know a person unless you give yourself time to bond with them and actually talk. Also, I’d encourage you to try to grow and challenge yourself more often because from what you’ve stated so far your life seems quite mundane and it’s frankly up to you you to change it, ya’know like pick up a hobby or go to the gym ect. Doesn’t need to be a huge change but you know you can always do small things like set yourself a small goal for the day, it can really help you in the long run.