This is my first time riding the Greyhound bus by myself. I'm very scared, I don't know when to get on and off the bus, and I'm also scared to ask for help.
I have two transfers in the whole trip. Would the bus numbers be on the ticket?
Generally when you get to the bus station, there'll be a board for information. Failing that, ask at a counter. One of these two sources will tell you the gate for the bus, based on your destination.
You've not specified your country, but usually the transfers and bus numbers have been on the ticket or receipt, for example:
The bus drivers are also usually VERY descriptive about every stage, announcing exactly what you have to do, when. If in doubt, check with the driver - there's always someone clarifying stuff with them, so you won't be alone.