Can not return to my house after falling in lava [duplicate]

The game is not supposed to automatically spawn you at your house, you need to have a bed in your house and to have slept at least once in it for the game to change your respawn coordinates.

Even when you have a bed if it is obstructed you can't respawn there, but the game is showing an error message for this.

So you certainly respawned at the original spawn point of your world, to find your house you need to remember the path you took the first time to build your house, or you can give yourself the permission to fly (creative or any other way) to look around and find your house.

If I am correct in understanding that your house was near where you first spawned in the world, as you seem to have said in the comments to your post, then you should be able to find it with a little searching. Go to 0,0 and look all around within a few hundred blocks, and you should find your house.

If you haven't used coordinates before, what you do is tap F3, and find the numbers that are labeled X, Y, and Z. X and Z are your lateral coordinates, and Y is your height (0-255). Walk in such a way as to make X and Z both go to zero.

Once you are there, you should find your house within a few hundred blocks of 0,0. If you're trying to do this without any cheats, you can make a map centered on 0,0 and zoom it out once (see linked article), that way you can see where you've already searched.