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Translation

• Context: Edward sulks over his ineptitude.
• ore wa baka da
  オレはバカだ
  I'm stupid.
• ano toki kara
  sukoshi mo
  seichou shichainai
  あの時から
  少しも
  成長しちゃいない
  [I] haven't matured even a little since that time.
• I.e. Edward did something stupid before, and he feels he didn't learn anything since that time, he hasn't matured, grown up, improved, etc. Nothing changed, and he's doomed to repeat the same mistakes he did in the past. He implies he's an idiot because he hasn't learned from his past mistakes.