Hello and welcome to the forum!

Waves*
When did you first discover that you are trans? (Ex. A few days ago, a few weeks, a few months)
Because if you just discovered these feelings you might want to wait before going to a therapist or a doctor. I had to explore my feelings for a few months before I was absolutely sure I wanted to transition/could accept myself. But that's just me, everyone is different. But most people in general explore their feelings for awhile before doing anything.
Is this the first time you've heard a voice? Because if it isn't you may want to see a therapist about that, it doesn't make you "crazy" by hearing voices...it's just that sometimes these voices can hurt you (mentally, emotionally, and physically). I have had strange experiences before, but I can reasonably say that these experiences have not negatively affected my life (stuff similar to hearing voices). So in that way, I place no judgement on what you're going through.
Wearing female clothing doesn't make you transsexual or transgender...it's more about how you feel inside and how you relate to the gendered world as a whole. Some of us have gender dysphoria that affects our mental, physical, emotional, and social health. Gender dysphoria can be a feeling of "wrongness" about your body, or it can be a feeling of not being perceived as you feel inside (people assume your'e a guy, when inside you are female). But, not every trans person had dysphoria; nor does everyone have it to the same degree. Usually gender dysphoria results in periods of depression.
You may want to ask yourself this question (assuming you haven't already), "Would I be happier as a female, being perceived and treated as female in social environments, being perceived/treated as female sexually?".
If discovering this about yourself "shocked" you, you can always stay here on Susan's and talk about it. There are usually plenty of people who have been in the same situation, or can understand what you're going through. This place is a rare jewel, use it to your advantage.

Hugs,
-Skye