Are you allowed to use loops in your PUBLIC song?

Apple Loops that came with the content downloaded from inside of Logic/GB?

Yes..

Logic Pro X and MainStage 3: Using the included royalty-free content in commercial works - Apple Support

However,

3rd Party loops you downloaded from outside of Logic or GB...or purchased or obtained by some other means?

Check the terms and conditions/licenses that came with those loops...

Hi... Please help me I just want to use a single loop from logic pro X for my my video and want to upload it on youtube will I get copyright strike????

No.... Your video should be fine. 🙂