Dreaming of a beach often symbolizes a place of relaxation, exploration, or a transition in your life. The crowded section versus the empty area may reflect your feelings about social interactions or the choices you face—perhaps you're feeling overwhelmed by others or seeking solitude and peace.

The beach at the mouth of a river suggests a convergence of emotions and experiences. This could indicate that you're at a point in your life where different aspects of your life are coming together and you may be contemplating how to navigate these changes.

Seeing a red swan is particularly symbolic. Swans generally represent beauty, grace, and transformation. The color red can signify passion, love, or strong emotions. The fact that this swan is swimming calmly might indicate that despite any chaos around you (the crowded beach), there is a part of you that seeks tranquility and beauty in your life.

Your clothing suggests a feeling of being unprepared or still transitioning into a new phase. You may be on the brink of embracing new experiences or emotions, but you might feel hesitant or unsure about diving in fully.

Overall, this dream could signify your desire to find a balance between social engagement and personal reflection, as well as a call to embrace the beauty and passion in your life, even amidst uncertainty. Consider what areas of your life may need more attention or exploration, and how you might find that balance.