Hey, don’t overthink life is all about changes big or small. We all misses our school and friends and wants to go back in time it happens at times but listen u have a wealth of happy moments in past no one can take those memories from u so let them free they will be urs forever. What I can feel about u is that u r an emotional person which is good but being practical at times is also imp. Let ur mind, heart be free from all these and don’t feel that u r alone we all are here to listen and to share ur thoughts. Try to divert ur mind from friends to studies as of now it should be ur priority. Stay blessed and stay healthy.