OP, some questions:>How are you washing your vagina?
Vaginas are self cleaning so you only need to sop the outside gently, don't put anything soapy inside, even. It will be uncomfortable can cause it to smell for some reason.
>What products are you using?
A normal bar of soap or shower gel should be enough.
>Do you have pubic hair?
Some people find they feel cleaner with less hair. I don't recommend fully shaving or waxing due to the itching but maybe trimming can help.
>What type of underwear do you wear?
Stick to plain 100% cotton knickers. Anything artificial will smell, silk a bit too.
Also, what do you mean by smegma? Are you trans? Do you mean discharge? That's normal.