Your attitude about life definitely determines what you get from it. It makes sense that you would manifest what you focus on the most, even if it's negative.
Your subconscious mind doesn't see things in "positive" or "negative". When you make a statement like "why am I always frustrated?" your subconscious only hears "I'm frustrated" and you operate from that cue.
It does take some time and practice to change your thought process, but it gets easier and is well worth the effort. Keep at it, and best wishes.
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