Praying at school in a non-Muslim country

**Assalamu Alaykum warahmatullahi wabarakaatuh. I'd like to ask this question that's been bothering me for a long time already. I was born Muslim, Alhamdulillah, but my parents are ex-Muslims. I haven't been a practicing Muslim as a child, but I still thought of myself as a Muslim. Later, a friend started introducing me more to Islam, and I did many research by myself, I started being a better Muslim and later learned how to pray, and now I pray all the daily prayers Subhan Allah. My parents know that I am a religious person, and they accepted me praying Alhamdulillah. And here's the main thing I'm concerned about: almost everyday, my school ends so late that I miss Dhuhr and Asr too, Astaghfirullah. I have tried praying at school, tried finding a private corner but it's extremely difficult. I have been thinking that should I talk with my teacher or my parents, but I'm also afraid they're gonna mock me etc, I don't have the courage Astaghfirullah. I feel so, so guilty even though I pray them when I come home and I come home when Maghrib time has already begun. I don't know what to do. Does anyone have any advice? Jazak Allahu Khair!**