struggling with the letter ض in al-fatiha

as-salamu alaykum, so i think i've been saying the letter ض all wrong when i recite surah al-fatiha and other parts of the quran. i literally just broke down crying because it hit me that maybe my salah hasn't been right this whole time. i watched some videos explaining how to pronounce it properly and now i'm even more lost. i've tried again and again but i just can't get it. the way i used to say it was with the tip of my tongue touching my gums near the top, not my teeth. but all the videos say you're supposed to use the sides of your tongue and not the tip at all. i don't even understand how that works. and now i feel so heavy inside because how am i supposed to pray if i can't even recite surah al-fatiha correctly? any tips or advice would really mean a lot