I created a nether portal, in the nether, and lit it using a flint and steel; however, when I step into it, it doesnt teleport me. The teleportation animation doesn't start either. It doesnt matter how long i stand in it it wont teleport me. I've even tried moving the portal and/or breaking it and re building it and it still wont let me use it. 

UPDATE: I am stuck in the nether... i have 4 pre existing nether portals and none will work for me.. i am stuck PLEASE HELP

It is a Realm that i pay for idk if that helps. 

UPDATE: my friend can enter and exit the nether just fine so its just me.. and yes i've tried closing minecraft entirely and opening it up again and still its not working

RESPONSE: I am not riding or transporting any mobs i am alone, i am not in sneak mode. I downloaded a local copy of the realm and had the same issue. I can stand in the nether portal for an indefinite amount of time and no animation happens at all for transport. I had minecraft and realm closed overnight on my pc and just logged in to try again. Same issue, not resolved. Stuck in nether.