Sorry, how is an alchemist going to retrain a feat?Guys, thanks for the comments!
About the haversack, I'm not allowed to buy one, sadly.
I'm also in a doubt about the Natural attacks. How would they improve when I reach BAB +6?
By now I'll stick with TWF and see what happens. Designing PCs can be really hard. I'll see how the campaign will evolve and the capabilities more suited to the character. If TWF is a nuisance, I'll just retrain at the next level.
My GM allows feat retraining once for each new level.
I really think you should consider Monk. If you swap Int with Wisdom, your Touch AC will be 18 at level 4, before magic item bonuses, which you can more easily afford having dumped the +1 cloth armor. You'll get TWF for free with your unarmed strikes, which will be putting out d8s of damage at level 4, and you'll hit more often. Your speed will be 40 and Stealth is a class skill. Take Skill Focus: Heal as a feat. Take Throw Anything or Throw Splash Weapon if you need to; you can retrain them later, right?
Ooh, the fighter just died a little more.
Not really. Fighter still lets you retrain more. And the Fighter's main benefit is replacing an old feat with a new one you could not have qualified for back then. Say I was making an archer and hit level 4. I take Weapon Specialization as my bonus feat. I also want Point Blank Master, which requires WS. Guess I have to wait a level for it, huh? Nope! Retrain an old fighter feat from level 1 and grab it, too!
How is that better than retraining any feat every level?