Ever since I bought it from the cartel market it's been locked. Is it because it says I lack the skill to use that? Do I need to see a trainer to get speeder piloting 1?

Your class trainer teaches speeder piloting at level 10.

Ever since I bought it from the cartel market it's been locked. Is it because it says I lack the skill to use that? Do I need to see a trainer to get speeder piloting 1?

 

To answer your question: Yes. You need to train speeder piloting skill to use a speeder.

... and you need to "use" the speeder to unlock it.

Once you get to level 10, you'll get speeder training lvl 1. You'll then be able to use your speeder. It'll also be available to unlock account wide in your collections. Typically for between 200-400 CC's

Once you get to level 10, you'll get speeder training lvl 1. You'll then be able to use your speeder. It'll also be available to unlock account wide in your collections. Typically for between 200-400 CC's

You aren't awarded Speeder Piloting 1 at level 10. It becomes available to train at level 10, but you must go to the trainer and buy the ability. It costs the immense sum of ... NOTHING.