i think all the proxies you tried are just nonworking proxies, if you want to test proxies then get a program called proxyway and load proxy lists into it and itll tell you which ones work and which dont.
Marlene spent a lot of time and effort creating a guide for everyone to use concerning proxies. You can find it here: viewtopic.php?f=22&t=4263 It's been a lot of help to many people in the past so I'm sure you'll learn something
I know a few but I dont know if they work with neopets or not... for other things i just use... ctunnel and mathcookbook and... um... proxcover.