Dimesion problems. Help needed

Hello all.

Today I decided to do some minor tinkering with dimensions, came up with a concept and put it into action.

...what I found out was that no matter what type of world you set it to (Nether, End, Surface) and no matter how many portals you make, it always spawns me in space.

no matter how many times I try, it keeps doing this. help.

https://www.youtube.com/watch?v=pjGUORJYPwA&feature=youtu.be