Dreams about art classes can often symbolize self-expression and creativity. The setting in a gravel lot may suggest a feeling of being in an unstable or unstructured environment, reflecting your current emotional state. Sitting in your SUV with the trunk open might indicate a desire to be open or to share parts of yourself while also feeling somewhat confined or protected.

The art teacher encouraging you to smile more may represent a part of yourself that seeks positivity or validation from others, suggesting that you might be feeling pressure to present a happy exterior despite your inner struggles. This could point to feelings of inadequacy or the need to conform to societal expectations of happiness.

The appearance of the lady with the first aid kit is significant; she represents care and concern. This part of your dream might be urging you to acknowledge your emotional wounds and seek help or healing. Your instinct to wipe the blood off your arm indicates a desire to hide your pain from others, even when it's evident.

Your expression of feeling "mad and overwhelmed at myself" reveals an internal conflict. It suggests that you're dealing with feelings of frustration and perhaps self-criticism. This dream may be highlighting the need to confront these feelings rather than suppress them.

In summary, this dream could be a reflection of your current struggles with self-acceptance and emotional pain. It may be beneficial to explore these feelings further, possibly through creative outlets or seeking support from friends or professionals who can help you navigate these emotions. Remember, it's important to take care of your mental health and reach out for help when needed.