T-squares are not uncommon. Almost half the charts have them.
What you've got are two planets in opposition that would like to achieve balance instead of swinging wildly between two polar opposites, but the apex planet, Neptune, upsets this quest for balance.
You can tell where the tension is being felt by looking to the house position and sign of Neptune.
They say you can resolve this conflict by looking at the "empty point" position (sometimes called the empty leg) of the T-square.
Your opposition is between planets involved in schooling and higher education, and of short-distance travel and long-distance travel.
A Fixed T-square is upsetting and a psychological struggle. It is desire to keep what has been obtained, and perhaps running rough-shod over others in an attempt to make the dreams comes true. A Fixed T-square sometimes shows that you don't adapt to change very well, and may bottle up negative emotions.
Mercury in opposition to Jupiter by itself brings sometimes poor judgment, often unfinished education, misfortune.
Neptune in adverse aspect to Mercury adds a changeable mind, being swept by emotions or dreaminess, a restless mind that is sensitive and unpractical at times. Absentmindedness and trouble remembering things are a possibility, or extreme restlessness.
Jupiter in bad aspect to Neptune brings trouble from the affairs of the House occupied by Neptune,
More emotional disturbances, losses through fraud, lies, or treachery, perhaps poor health, that kind of thing.
So much of Astrology is blending influences. You won't have all the sorrows predicted, but the blend of them will somehow ring true as your life plays out. Outer planets like Jupiter and Neptune don't always bring their influence to bear in childhood as much.