Law of Attraction and negative feelings

The law of attraction states that negative feelings are low vibration and will attract more low vibration, or negative things to us. I’m struggling to reconcile this with Brooke’s teachings about 50/50 and that we should feel our negative feelings.

I know Brooke is also an advocate of the teachings of Abraham, but Abraham states that life is meant to be mainly joyful and fun, and that every time you feel a low energy emotion you’re pushing away what you want and attracting more negative things.

I just want to understand how I can integrate these teachings.

Thank you!