I want to upload but I don't seem to be able to I do get people uploading from me when a file is nearly finished but once it's fully downloaded nothing. I'm starting to feel guilty.

In my monitor tab it just says that transfers were interrupted. I have uploading set to unlimited and the slots are set to 99. I've enabled ulrapeer; in the library tab I've set everything to share everything. but no luck. I am usually doing this in a hotel with a firewall but I am able to download so why not up load?
Also can I seed a torrent by just sharing or do I need to do something else?

I've lots of stuff to share and I hate the idea of just being a parasite.