Transgender is an umbrella term for all who express gender-nonconforming behavior. Cross-dressers, drag queens/kings, and genderqueer are all under this umbrella.
Transsexual specifically means people who experience gender dysphoria, and thus wish to transition from their birth sex to a different sex.
The big difference is, transsexual usually specifically means that someone experiences clinical gender dyshporia, a feeling that their body is wrong or their social role is wrong (they don't just want the freedom to be more masculine as a woman or more feminine as a man, they actually feel like they should be the opposite sex.) Those simply under the transgender umbrella don't necessarily feel the need to change their bodies or their social roles completely, they just more go against the actions and dress and behaviors and presentation that culture usually uses to define gender.
I feel like you might want to consider the difference. I didn't hear anything in your post about being uncomfortable as female physically... and there have been a few young people here who have transitioned and later realized that their problem wasn't with their bodies, it was just with the social expectations of their gender. So yeah... if you're uncomfortable with your body, and being physically female and being perceived as female socially by people actively bothers you, those are more transsexual tendencies. If you merely want to adopt a more masculine role, be dissociated from traditional markers of femininity such as beauty and passivity, but don't necessarily feel uncomfortable with being female, then it's more just a transgender-umbrella thing where a change in presentation might be all you need.
Just some extra food for thought to throw on there.
Welcome, by the way!