Yeah, getting drunk is a poor plan. If you've got a close friend to hang out with, that can be its own help, but on the other hand it sounds like a lack of social contact is part of the problem here.
I'd definitely recommend cutting back on the tea, or at least switching to something herbal or otherwise decaffeinated. Rooibos seems to be a good substitute. See if you can drink more water than other beverages.
As for the paralyzing thoughts, meditation may be an option. Take some time, maybe 15 minutes, to sit back and experience those feelings. As much as you can, strip them of context. Sit comfortably, breathe deeply and regularly, and focus on something material (an object, a pattern, a rhythm, basically anything but your own thoughts) until you feel calm. Then move on to thinking about your fears. Don't think about how you're going to overcome them, and don't worry about how they're impacting your life. Keep your mind off the meta. Focus on the fear itself. Remind yourself that it's okay to be afraid. Fear is a part of who you are, and it's a part of who everyone is. There is no shame in being afraid. Examine the fear, just as you might examine the pain of an injury or the humor in a joke. Take the lesson the fear is teaching you, which may be that there is no lesson here at all, and remember that the fear is just a part of you. You are more than fear. You don't need to avoid it, you don't need to distract yourself, and you don't need some mighty wellspring of courage. You are all that you need.
Or something like that. I expect that whatever thought patterns work for me will be different from you, but basically I would try to grapple with your emotions in a context where there's no external pressure. All that you need to worry about here is what you're feeling, not how it's going to affect the rest of your life. You can deal with that some other time. It's a different problem.