Some things to consider and possibly discuss with a therapist.
1. It's uncommon, but some cis women want their breasts removed because they dislike them so much. And many cis women are quite uncomfortable dressing/presenting femininely. These don't necessarily equal "you're trans".
2. If what you're experiencing is in fact dysphoria and not another kind of discomfort, bear in mind it IS something that fluctuates. There are good days and bad days, and there is such a thing as (consciously or otherwise) temporarily suppressing it to get through a situation. How else would so many people on this site be in their 40s or older before finally concluding they can't suppress it anymore because it's destroying their quality of life? If sex dysphoria is present, the fact that it isn't perceived 100% the same at all times doesn't necessarily equal "genderfluid".
3. There are so many ways to explore this issue that are completely, entirely reversible. Going straight to hormones to experiment - which can cause irreversible effects faster than one might expect - is not a good idea. If it turns out what you've been experiencing isn't dysphoria at all, and you go on cross-sex hormones, this can actually CAUSE dysphoria. First consider trying:
Wearing "male" undergarments like boxers or briefs - this is completely unobtrusive and a common first step for that reason
Wearing a binder - with your usual feminine clothing, and with other clothing, so you can tell how you feel about looking flat-chested vs. how you feel about different clothes
Dressing/presenting in a more neutral or masculine way - with and without a binder
Getting a unisex or masculine haircut
Asking a few trusted people to help you explore these issues by addressing you with male or gender neutral pronouns for awhile, and/or a different name
Participate in a message board and introduce yourself as a guy, see how it sits with you for people to address/refer to you as male
Vocal exercises to slightly deepen the voice, and/or working with a voice coach to see how you'd feel speaking in more neutral or masculine speech patterns
Wearing a packer
4. Back on the topic of T. How much research have you done into the effects? It doesn't just deepen people's voices, and there's no guarantee which order you'd get certain effects. You might sprout more body or facial hair first. You might get genital growth (enlargement of the clitoris). Your hairline might change. And bear in mind, T won't make breast tissue go away - that has to be done with surgery. Check out this link for details on the effects of T.
http://www.ftmguide.org/ttherapybasics.html
