How can people upload from me with a vpn network useing utorrent? if I use utorrent conecting through a vpn network I thought it was a private network. How do people still connect to me?
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If that VPN network has internet access (i.e you can browse internet while on VPN) then poeple on the internet can connect to you (if there was no firewalling or NATing that prevents it).
A VPN is just a tunnel (pipe), the traffic is private only inside that tunnel. Once it reaches the other VPN side, you will appear exactly like a person who is physically connected to the network on the VPN side, thus if torrent users can reach you in that network, they will reach you when your VPNing to that network.
In a tunnel there are features to ensure that both sides and only boths of the connection can recieve the data. There is obviously the encryption AES, 3DES etc but also a SHA1 or MD5 hash to ensure the data hasnt been compromised and can only be read by both trusted partys.
I guess the only way an intruder could get the data is if they know the encryption keys.