Vehicles usually symbolizes our passage through the journey of life. The way that you travel through your life's journey, and your effectiveness in controlling your life.
The type of vehicle will give indications of the type of experience being related in the dream message. For instance, an ambulance will indicate a need for healing in the giving and receiving of experience, a police car will signify the need for discipline in experiences, an old car might suggest old habits, or 'things the way they used to be' or the need to change the old way of doing things...etc.

Relatives - usually represent an aspect of yourself relative to the character of the person in your dream. Sometimes represents your family traditions, subconscious attitudes, conventions, or even talents, that are part of the unique psychological and social environment a family provides.

Mother - represents, nurturing, wisdom, the subconscious, intuition, natural and instinctive life, and more experienced part of feminine self aspect. Also, your relationship with your mother.

Hospital - symbolizes a need for for care, healing, and recovery. It could be physical, psychological, emotional or spiritual healing that is needed.

Sinkhole - represents an obstacle in the path towards your goals. That you were able to safely get across, it suggests that you feel capable of overcoming whatever obstacle that is currently presenting itself in your waking life.

Pink - a feminine color that usually symbolizes love,(tender love rather than passionate love ie: the love for a child, sibling, or parent), happiness, joy, compassion, the attainment of a goal(success), health and good feelings.

Silver - symbolizes something of value with regard to your personal development. May symbolize the feminine (silver has associations with the moon) which would represent intuition; or the subconscious.

Dress - represents femininity, how you present yourself to others, and a need to exteriorize feelings(wanting to, or showing, everyone your state of mind, attitude, etc.).

Uniform - This could be hinting at something in your life which you feel you have some sort of duty or obligation to. It could be a symbol of conformity or thoughts shared by others as well.
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Have you been feeling particularly 'on top of things' lately?
Are you feeling good about yourself, and your accomplishments?
Are you currently in a relationship, but you feel he's been acting immature?
Are you wanting a more stable relationship, possibly with someone who is a little older?

Your dream isn't weird at all. That you are flirting suggests you are feeling confident about yourself and your abilities!

Hope I could give you some insight!

You're welcome!  Feeling comfortable with yourself is a good thing! Very few people have attained that goal!

Hugs n' Happiness,
J