Keep your first speeder Until you purchase Pilot Rank 3.
Hopefully, you purchased one of those super cheap Cartel Market mounts nobody wants. The ones that sell on the GTN for less than 8,000k. Not even the speeder vendor can cut you a deal like that.
I stocked up on 5,000 or less Ubrikki Sand Devils or whatever the other ugly Ubbriki mount is called.
With these cartel market mounts, movement speed automatically increases as you unlock new speeder licenses. So you never have to purchase another speeder.
You could also pay 4.99 for the Digital Edition Upgrade Pack
It will give all your characters a free, good looking speeder, that will last you until you start getting some of the nicer loot drop speeders at lv50.
info url: https://account.swtor.com/user/digitalupgrade