The weight limit for swings depends on the swing.
Some swings have a weight limit of around 100 lbs to 200 lbs and some swings have a weight limit of up to 600 lbs.
The cheaper metal child swing sets usually hold up to 100 to 130 lbs before they start to bend.
The more expensive commercial type swings and swing frames can hold up to 600 lbs or more.
Wooden Play Set Swings can usually hold up to 600 lbs as well depending on how strong the wood is.
We have a wooden swing set in our backyard and I weigh around 150 lbs and I go on our swing with my children and have fun.
It's never broke or sagged or anything and the swing seats are made for both adults and kids and have a 660 lb weight limit.
I built the swing set to be strong.
The commercial playground swings are also built to be strong and hold adults as well as children so it should not be a problem for you to go on the swing if you're an adult.