Why doesn't my Wi-Fi reach my room?

My house is only one floor, the little internet box is in the living room and my room is the farthest and when I connect my laptop to the Wi-Fi it either goes really slow or just looses connection entirely however I also have the Wi-Fi connected to my iPhone and I've noticed that when I'm outside on the opposite side of the living room and my room the Wi-Fi does reach which is kinda dumb since it reaches one side more than the other. Like what can I do so I guess the signal changes which side it goes too or to make my Wi-Fi signal stronger?

.to many walls? Get a repeater? Move the wireless router closer… Can i have a cookie?

Http://www.jesusnjim.com/pc-repair/networking/wireless/fix-connection.html#blockages

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