First of all, Welcome!

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A. To what extent I am transsexual?
Transsexual means that you identify as the gender opposite to your sex and you wish to live and/or change your body to match said gender identity.
Transgender includes any gender variant person that identifies as a gender that doesn't match their GAAB (Gender assigned at birth). And transgender also includes other identities that blur the lines of the "normative gender binaries". I should note that "Transsexual" falls under the transgender spectrum.
Feel free to look up "transgender" in the wiki here at Susan's or elsewhere for a more comprehensive list.

Basically you probably want to explore various gender identities. I think that only we can really pose the important questions, since we know ourselves best.
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B. Whether I would be happier as a male or a female?
How do you feel (self esteem wise) about having a male body?
How about aging in a male body?
Do you enjoy social interactions as male, or would you prefer to engage in girl talk?
If you could begin life again, what would your body be like? A mix of male and female, or one of the two?
Just a few questions to get you started

From what I can tell, you may also wish to enter the forest and explore for awhile (the Androgyne section of the forum). Some of the more knowledgable non-binary members reside there, and are quite friendly and helpful.
-Skye