HELP! Why do I act like this at school?

I'm a gemini and i think i got to the root of your problem since i am the exact same way as you are with that. See i have an earth ascendant with is Virgo. I do not open up easily unless i know and trust someone. You have an earth moon which is your inner thoughts and feelings that is in Taurus this is part of why you are like that the other part is because of your ascendant being in Aquarius its the air sign noted for being the shy of the air signs kind of detached but love to study (my ex is so smart can tell you everything about any topic online but in person hes a deaf mute.) While you have an out going sun sign your two other almost more important signs are shy and reserved until you are comfortable signs. Dont worry with age this gets better school was a scarey time for me and i got good grades was really shy but also got picked on alot. If you want to change that make sure you wear clothes that make you feel good about yourself this makes your attitude alot better and when you look good you feel good and are more open to talk to people because you feel good enough. People have the misconception that because you are gemini it means you are social and true you can be so long as the ascendant and moon are placed in good placements for that. A gemini with leo moon or ascendant would be out going. Also most geminis i know are very to themselfs and not very talkative unless on the internet or phone.