Let me make a couple of observations.
First issue. You really feel that you're male and are trying to decide whether you can stand to live as a masculine woman? Think of it this way. You're twenty and could live for another sixty or eighty years. Do you see yourself as being able to hold on for that long, becoming an old woman (instead of an old man) without transitioning?
Do you feel, in your gut, that you can just keep on trucking as a woman, even if you feel that you're not really a woman? You talk about living a lie, being unhappy. Does it make you happy when people call you "he" and "Konnor" and unhappy when they call you "she" and "birthname"? If so, how long do you think you can suppress your maleness? If so, for how long do you think you can let masculinity substitute for maleness? They are not one-to-one and onto.
In some ways, yes, you will be an outcast. But I look at a number of my acquaintances who transitioned more than five years ago. They are normal guys, not outcasts. Right now, I'm early in transition and am STILL going through an I-don't-want-to-be-trans stage. I am insecure enough about myself that I don't want new acquaintances to know about my past. The guys I know who are later in transition tend to be much more relaxed about themselves. In more enlightened parts of the country, the "outcast" label may be largely in our own minds, not in other people's minds. We might have a harder time finding sexual partners, but I don't know. LOTS of people in my local trans community are in relationships. I see both trans and cis partners.
You say that you will graduate from college in a year. Have you changed your name? If not, then I can think of a lot of logistical issues. If you don't transition physically, do you want a masculine name? If you do transition, do you want your college diploma to have a female name on it? How easy is it to change your name retroactively on your school records and diploma? As far as that goes, what about work history and credit history? Perhaps I'm not being fair, asking about logistical concerns when the issue is more psychological. But finding out some of this stuff can actually help you to decide how serious you are.
Finally, therapy. I do feel that most of us get to our own decision point without direct outside intervention. I mean, it's a personal journey. However, a good therapist can facilitate the process, ask the right questions, make us stop and think when we get too impatient or headstrong, and help us to figure out what the most important questions, answers, and issues are. If your therapist isn't sufficiently facilitating your self-exploration and your decision-making process, then you could wallow in pain and indecision for a lot longer than you need to.
You're still quite young. On the one hand, I'm thinking, "No time to waste!" But that's a retroactive thing--IF you are truly a guy, then you ought to live happily for as long as possible and build up as much of an "appropriate" (male) youth/past to make your future easier. And on the other hand, I'm thinking, "You have time, Konnor. Take it. Take all the time you need. If you're a guy, you need time to figure it out. If you're not, you need time to figure it out."
There's just no substitute for time.