I made a proxy so how much bandwidth can I use? Is there a cap? If so, how can I check how much bandwidth I've used.
Are these Ip shared or are they dedicated? Are my vps that i made in my droplet being shared and am i the only one using it? I know people owned them before but as of now, is my current ip being shared?
1) It depends on the droplet you have, as you can see here all droplets have a different amount of transfer.
You can check your bandwidth usage once you created a droplet, if you login you will see this at the "Graphs" menu item.
2) A virtual server's IP address is static and reserved for your virtual machine until you destroy it. Rebuilding a virtual server retains the same IP that you had initially. You own your own droplet, and have access to all its files. Its a virtual server so the bare metal server is shared, however your own system will be only for yourself and really fast.
Depending on your plan you get some TB of transfer. But at this is time that is theory because you can't see how much bandwith are you using in the control panel, so DO is not charging if you go over that limit.
To see how much bandwith you are consuming you can do it in your VPS with the vnstat command.
You can even use some parameter as -d (to show the daily usage) -w (weekly) or even -h (hourly usage) and it will show the inbound traffic (rt) and the outbound traffic (tx).
This is an example of one of my VPSs: