Honestly, I hate to come off condescending (actually, I don't), but if you paid any amount of attention, you should have known this was coming. It was alluded to many, many times.
I mean, you are in a guild right? Don't you have other players to help guide you? Help with who you should probably farm? For a day 1 player to totally miss the meta characters over time is kinda ridiculous. You kind of want entitlement for length of time played but obviously there were probably some bad decisions made in there along the way and to only have Leia / STH at those levels proves there were probably more than one along the way.
I'm not knocking you for being F2P, in fact, more power to you. However, when you start complaining that you can't do an event even with all signs pointing to who you would need* then I really don't have that much remorse.
* - does not apply to Phoenix / Thrawn event.