Do you fall asleep immediately when you lie down to sleep?

I always find it difficult to fall asleep.
Even if I keep my eyes closed for an hour, I can't drift off.
I've tried taking melatonin and magnesium, but they had no effect at all.
I've also tried sleep aids, but I didn't feel much of a difference.
The last resort is getting a prescription for sleeping pills, but I don't want to go that far, so I just force myself to endure it until I fall asleep. T_T
I'm truly envious of people who sleep well.