You appear to have an extraordinary amount of drive and determination. And I think missing a years worth of school only to graduate on time with honors, along with the clarity and passion in your post proves it.

Just some Q's to consider that might help you devise a plan...
How often do you plan to visit home? What is your main source of transportation to get home? Are you able to maintain a part-time job while at school? Is making the potentially arduous trek home once a month plausible in order to see T3? Would T3 allow phone sessions during times in between in-person sessions? Would it be possible to see a T4 while at school, and see T3 during holiday breaks? What if you see T4 and become attached to him/her? Will your parents cut you off from T4 then as well?

I know this is hard and confusing for you. You will figure it out, and it will all work out. In the meantime, you can count on us PC'ers to support you.