Reality would be my guess. Looking in a mirror gives you a look a yourself and what you've become, making it the reality.
Listen to music and find a nice comfortable setting for you to study. You could also listen to music.
“Gave” is past tense. The past participle would be “given”
You can be more sustainable in daily life by buying products that don't have excess packaging, turning the lights off when you leave a room, taking shorter showers, and carpooling/biking/using public transportation instead of driving.
