AITA if i break up with my girlfriend for no real reason?

I've been dating my girlfriend for about 6 months now and its gotten to a point where i hate to admit it but i think im either bored of the relationship or i have fallen out of love. This feeling started growing in me about a month ago and in the beginning it would only come when i was away from her for a few days and i would fight it but it would always come back, it gradually snuck itself into even when i was physically with her. I really do try to enjoy my time with her, and as far as she knows i do, I just cant ignore this anymore. It's not an angry or upset feeling its more of a numbness, the things that she does to me that used to excite me(hugs, kisses, any attention) doesnt have the sane effect as it did 5 months ago, same with the things she says, doesnt thrill me like it did. Plus she isnt on my mind like she used to be, i try hard to make a conscious effort and force myself to think about her, I try hard to make myself want to be with her but i cant fight myself anymore, We're both young and i kinda want to live out the rest of my teen years single and free, I feel bad because she hasnt done anything wrong and i know its gonna crush her if i cut things off, but i've slept on this feeling so many times and it hasnt left. I dont wanna waste her time, She's a sweet girl with a great heart i just dont feel it anymore.