Need Help! I'm To Pessimistic for an 14 year old.

[Pyramid]

Hello

for an 14 year old i get to much commenst on my pessimisem from my friends,school mates,parents,teachers,...and people think that im an freaking goth where ever i look i see bad even in good thinks i see bad stuff.

So i started to meditate and i meditate for 2 years now (constantly) every day for 30 minutes and i reach that happines while meditating,but i cant transfer that felling in real life.

So if any one can answer me how to be more positive it would be great,all this negative thinking will tottaly screw my life up. I also get comments that im to MUCH intested in socialism and anarchisem(and i was sent to an school cauncler for this.

p.s: i think that all my pessimistic comes from SCHOOL from math and phisics,i have one f**ked up teacher that has something against me. I always get super bad grades just today i got an F at math,but my knowladge was for an D+
and at phisics its the same thing.

So this is my storry hope that you can fill me up on how to be more happy, i never didnt try marijuana before can this help to become more happy?