Questions about tor

1. Can websites see if I'm using tor?
2. Can other people use the same exit nodes as me, meaning someone has used the same tor configuration before?
3. If I connect to tor, am I the only one who has used that ip address?
4. How is it different from VPN?
5. Does tor give you a different location every time you change your identity?

1. They can't really detect that you're using TOR just by look at your requests. However, the list of all tor exit node IPs is publically available, so some sites/services block that entire list.
2. Yes.
3. No.
4. There are a lot of differences. Tor is usually very slow. Users running tor nodes may sniff your packets.
5. No. Sometimes it even assigns you the same exit node. It's possible to force it to use a specific node. First look at the node list and write down the node name. Then, edit the torrc file and add this to the end:

substitute 'nodenameX' with the actual node names