My ipod touch still wont connect to internet!?!?

Whenever I try to connect my wifi network it says unable to connect to network. Its a secure network and I typed in the right password for sure. I went 2 starbuck and tried to connect to there wifi and it said cant find the network and I know they had wifi there were other people there using the wifi. And I tried to connect to a neighbours network that wasnt secure and had no password and it said cant connect to network. I turned on wifi on my ipod and did everything it told me to do but I still cant get it 2 connect. I have no idea wat else 2 try. It wont connect to any wifi anywhere.