Dreams like yours can be quite intense and often reflect deep-seated emotions and experiences. Here’s a possible interpretation of the elements in your dream:

1. Falling into a pool: Water often symbolizes emotions and the unconscious. Falling into a pool could indicate that you are feeling overwhelmed by your emotions or situations in your waking life.
2. Knives: Knives can represent conflict or the potential for harm. They may symbolize feelings of vulnerability or the fear of being attacked emotionally or physically.
3. Someone helping you with a dog: Dogs often symbolize loyalty and protection. The presence of a helper could reflect your desire for support and companionship in tough situations.
4. Gang of racist people: This could represent feelings of threat or discrimination you may be experiencing or witnessing in your life. It can also symbolize a sense of societal fears or personal struggles with acceptance.
5. Threat and self-defense: The act of stabbing in your dream may signify a strong reaction to feeling threatened or powerless. It could reflect your inner strength and willingness to fight back against oppression or fear.
6. Hiding from the gang: This may indicate feelings of isolation or the need to protect yourself from external threats. Not being able to see your boyfriend or son might express fears regarding the safety of loved ones or anxiety about being separated from them.

Overall, this dream may reflect feelings of fear, vulnerability, and the need for protection in your waking life. Consider reflecting on any current situations that might be causing you stress or anxiety. It may be helpful to seek support from trusted friends, family, or professionals to navigate these feelings.