The broken drinking glass a symbol for your vulnerability, represents your ability to get down to the core of the problem. Perhaps you are afraid of emotional hurt or an unexpected situation that throw you off track, means something in your life that is draining the out of you. The glass as a fragile object reminds us that despite our protection we are fragile, a symbol for falsehoods and deception. Your dream expressing your fears and telling you to be careful to avoid uncomfortable situations, a hint for something very personal to you.
It is also possible that the broken drinking glass in your Dream symbolizes changes or renewals, a signal for your quest in your self-identity. The glass interpreted as an old problem that you need to let go of to make room for the new, signifies disloyalty in some area of your life. Another interpretation that the broken glass has a connection to your subconscious and signals you that old beliefs or ways of thinking need to be broken in order to reach higher consciousness, a sign for a message or word of advice that you need to heed.