I'm guessing you're like 16 or so. You've never had a girlfriend, you've known this girl 6 weeks and say you're in love.
I know what I will say will fall on deaf ears probably but if you can trust me at all, the truth is that this is what is called "young love" / "puppy love" / "first love" etc. It will pass, and you will probably compare every girlfriend you have for a while to this girl but it simply isn't meant to be. It's a normal phase of life to be "in love" with someone and talk half the day every day, then for it to go sour. That's life. It sucks, but it's part of growing up so enjoy what you had because it sounds like it's probably ending pretty soon
I sound like a dick but people will back me up on this, it's 100% true. It's just a phase. It's normal, you think you're in love but come on, you've known her 6 weeks.