My Cancer Stellium In The 12th House - Meaning??

Hi,there. I've been immensely compelled about the stellium in my 12th house which I've observed from my birth chart and I'm pretty sure it is playing a major role in my life,especially since I'm 19 now and nearing adulthood. But still,I'm really scared about this - what if this will collectively lead to my downfall,especially since I have kind of a low sense of self-esteem and I must admit,I do have trouble articulating my feelings and thoughts verbally to people. Like I'm shutting off a huge part of myself from them,preventing them from seeping deeper into my soul until I'm ready to allow them to.

During the time of my birth, the Sun,Moon and Venus coincidentally aligned in the sign of Cancer - all in the 12th house as well! Which kind of shocks me in a way. Is there any major significance of this overall planetary alignment?

Additional Details:

My Date of Birth : 1st July 1992
Time of Birth : 8.47 a.m
Place of Birth: Petaling Jaya,Malaysia


Thanks