Wireshark 802.11 on monitor mode, not able to see http protocol with wpa2-psk

Hello everyone, Lately Ive done dual-boot to my laptop with Windows 8 and Ubuntu 12.04, I have succefuly managed to use monitor mode to capture packets from my local wlan. To enter monitor mode I use: sudo ifconfig wlan0 down sudo iwconfig wlan0 mode managed sudo ifconfig wlan0 up

When I capture packets(on wpa2-psk protected wlan) I can only see 802.11 protocol, I tried to use WPA PSK Generator, and tried to write: WPA-PWD:PWD:SSID in the options in wireshark on the 802.11 tab.

When my wlan was oprn(password-less), I saw protocols like HTTP,UDP,TCP... and I did manage to check and I have captured packets from another computer in my house.

I want to capture packets in my wap2-psk protected wlan, but I want to encrypt it with the password and see the protocls like: HTTP,TCP.. Is that possible? If so how? Thanks.