You can't have super-strength without super-durability. After all, for every action there is an equal and opposite reaction. Whatever force you exert on another object, an equal force is exerted upon your body. Granted, there are ways to disperse or redirect that force safely with the right training, like how karate experts can break bricks and boards and such, but it has to be done in a very precise way so as to minimize the amount of force required, so that it stays within the body's limits. It's not superstrength, just the properly targeted application of normal (trained) strength. In order to exert superhuman force, you'd need to be able to withstand superhuman force as well. If you wanted to, say, lift a semi truck above your head, you'd need a skeleton strong enough to support the weight of a semi truck.
So you could have super-durability without super-strength, but you couldn't really have the reverse.
You can have Super Strength without Super Durability.
Not every Super Strong human is bullet proof, they may have tougher muscles and stronger skeletons, but they don't need to be built with skin stronger than metal that resists bullets.
Plenty of characters exists in comics that are super strong without being bullet proof.
We already have IRL strong men that can lift incredible amount of weight.
WWE's Bobby Lashly is able to dead lift 1,000 lbs as his record, that's ½ ton.
He's definitely not bullet proof.
But he's stronger than the vast majority of humans.
And he isn't even the strongest guy in WWE history.
Amongst the strongest human beings ever employed in WWE
Braun Strowman was able to lift a
2500 lb filled wheel barrel.
Having Super Durable Skin / body where you can just literally tank bullet rounds is a different thing all together.
Yes you will be stronger than average, but your defensive power doesn't necessarily have to scale with your durability.
Look at DC's Legend of Tomorrow,
Nate Heywood AKA Steel has a super durable "Steel like Skin" when he activates it, his strength is above average in "Steel Mode", but he doesn't have Superman level strength while in "Steel Mode".