Made Mistakes In Surah al-Fatihah

So i was praying and than i realized something was wrong when i was reciting surah al-fatiha and i felt like i was making mistakes and than i was really confused than i searched surah al-fatiha i saw 2 lines were different than what i was reciting all these days and i am still not sure if it happend only that time or i was doing this all along after this i was really dissapointed how all my Namaz went to waste and was depressed and i still can't get if i was really doing it wrong all this time or if it was just this time please help and tell me what should i do