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.