My interpretation is that she has been really depressed (to the point of wanting to commit suicide:"Wanna tell you just how hard it's been trying to talk myself out of jumping"). She got through that and feels like she has a second chance to live her life to the fullest. Now she wants to push herself to the limits to try and feel something instead of the numbness of depression. I can relate and I love this song very muchly.
My interpretation is that she has been really depressed (to the point of wanting to commit suicide:"Wanna tell you just how hard it's been trying to talk myself out of jumping"). She got through that and feels like she has a second chance to live her life to the fullest. Now she wants to push herself to the limits to try and feel something instead of the numbness of depression. I can relate and I love this song very muchly.