Macbook bad internet connection WIFI
Over time, Wifi hardware has progressed through several versions. In addition to higher speeds, the newer versions tend to offer better connection quality when there are many wifi signals and other interference in the vicinity. It could be that your computer has older wifi hardware than your phone, and hence is not able to handle the interference as well, producing slower speeds.  Interference is especially likely if you live near many other homes with people using wifi, too. 

If you are on a Mac (assuming you are because this is AskDifferent), you can see what Wifi revision your Mac supports by doing the following:
Click the menubar Apple logo in the upper left corner of the screen, then "About this Mac", then "System Report", then "Wi-Fi" mid-way down the list on the left.  About 14 lines down in the right-hand pane, you should see an entry for "Supported PHY Modes:".  Next to this you'll see something like "802.11 a/b/g/n/ac". Those letters indicate the WiFi versions your hardware supports, with "a" being the oldest, and "ac" being the newest. Versions "n" and "ac" in particular added improved support for handling lots of interference from congested airwaves.

[Added based on receiving more model information from OP:]
You have support for wireless version "n" in your laptop, but not version "ac".  There may be a performance difference between these two standards in your situation.  If you can find a machine (computer, cell phone, tablet) with support for "ac", try testing that in your room to see if speeds are better than you are getting on your 2008 Macbook. If so, then this is the issue (and please up vote this answer; thanks!).