Hello dianak123,
Thanks for your post to Apple Support Communities. We have some suggestions that may help with that auto-correct issue. First, let's see if you also use predictive text on your iPhone.
Tap on Settings > General > Keyboard. See if Predictive is enabled.
Then, go to something you were typing in. Type "well". Once the predictive suggestions pop up to auto-correct it to "we'll", make sure to tap the other predicted suggestion of "well". Do this a few times.
That will often help the system learn that when you type "well" you do mean "well" and not a word that needs auto-corrected.
Here's more information about using predictive text on your iPhone:
Use predictive text on iPhone - Apple Support
Take care.