I also discover that there is difference between "freerolls," SNG, and the "real tourneys". I also struggled in cash games vs tournaments. I found my "niche" in SNG, and whatever money I win over the week, I take half and treat myself to a nice tourney, or two smaller ones with 2-3 rebuys. Sometimes I splurge myself in cash games. Find what you "like" and have success, and make it as your "base" - your specialty, before moving to other areas. Although all poker games have the same cards, how you play them is different based on what game you are playing. Try to reflect after your games on your "thinking" after different games structure - write down your emotions - happy, sad, optimistic, defensive, aggressive, intuitive, etc.. See if there is a pattern and why? What are your goals for the session, maybe they play a subconscious mindset of how you play, OR, they way you play doesn't fit other games structures.
Good luck, and when in doubt - All In!!! (LOL)