OK, MTM, I finally managed to download and play your world.
Um, how do I say this? ...You are WAY undersupplied. Your torch lighting is FAR too dim, and you have no lighting or protection in the fields surrounding your house. Add to that the fact that your access routes are all messed up...basically, you're asking to die.
Really, at this stage of the game, you shouldn't even be building aboveground. You should have a little hidey-hole dug in the side of a cliff (preferably next to a large coal deposit), and you should mine for TONS of coal and iron. Once you have a full set of iron armor and several stacks of coal, THEN come aboveground. Granted, the village there is highly helpful, but really, without access to the underground minerals and without protection...you're doomed.
If you really want to keep going, ditch all your stuff in a chest and go find a desert. Get some cactus and some sand, and build a cactus wall around your village. (A simple cactus farm can be made by digging two rivers 1 block apart, placing sand between them on alternate blocks, planting a cactus on each sand block, and placing blocks adjacent to the (empty) block above each cactus. Since cacti can't be placed next to other blocks, the cactus segments that grow will immediately pop off, hopefully into the water, where they will be carried down to a single collection point.) Since cacti can't be placed directly next to other blocks, you'll have to stagger the wall as you place it. Be sure you have the sand flush with the soil on the outside, but dig a trench on the inside, so the villagers don't kill themselves on your wall by accident. Also don't forget to build a door or two in the wall so you can get out later! By building a cactus wall and properly lighting the inside area, you'll be (mostly) unharmed by hostile mobs while you build, and after a night of mobs killing themselves against your cactus wall you can come out in the daytime to pick up the drops--just watch out for morning creepers!
EDIT: Also, build yourself a compass and a watch ASAP; once you've built one of each--EVER--you'll be able to pause the game and go to the statistics screen to use them--even if you don't have one in your inventory! (Go to Statistics->Items and scroll down. The item icon is just as functional as when it appears in the inventory--just remember that the compass points to your original spawn, NOT necessarily North.)
EDIT 2: Cactus wall diagram (C is cactus, s is sand (or dirt, just remember that cacti can only be placed on sand)):
CsCsCsCsCsC
sCsCsCsCsCs
