You not only want to kill yourself over a girl, but over what she said to you?
Man, that's sad. Your whole principle of self-worth is based upon what other people say to you, especially those people that do not seem to like you. Not just sad, it's completely effed up!
How do you think she will react when she finds out that you're dead? Most likely, she'll just shrug her shoulders, toss her hair, and get on with her life and her friends. Do you really want such a superficial person inspiring you to kill yourself?
Part of how we're identified and judged is by the people who inspire us. You are inspired by a completely self-centered, judgmental, and cold-hearted hündin! Not only that, but you allow the inspiration to guide you into thoughts of suicide, instead of thoughts of self-improvement.
Such people are commonly called "Losers." Do you want the word "Loser" tagged onto your headstone?
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.