Hello dear ,
The condition you are suffering from is called as posthitis
that is swelling of prepuse.
It mainly happens during trauma of sex.
As you are virgin this looks like irritation to the skin due to some chemical, may be a new under wear.
You also mentioned increased smell. This may be due to increased secretion from penis glands due to irritation.
Was tip of penis with normal saline, you can get normal saline in medical shop.
Wash twice daily for 5 days you will get relief.
Hope I answered your query.
Wishing you good health