Lyric discussion by AlecsPen 

Cover art for Rootless lyrics by Marina and the Diamonds

I think Marina just relates the feeling of being entirely on her own away from anything that makes her feel comfort. it is really a powerful song she has.

it's called rootless which implies she has nowhere to run from as she is not rooted to the ground so she is just a person roaming around space and she can never find a home because she doesn't know where she's come from so she's doesn't know where she can go to. I think she wishes she had something to hold onto some origin, but she's just in species mode