Loki thouched Tesseract and he can't lift Mjølnir.

Not anyone, only powerful beings. In IW Thor said to the Guardians (when they asked why they couldn't have a weapon like thor) that one weapon like Storbreaker would disintegrate their bodies.

One thing I didn't like was the fact that Captain America lifted Stormbreaker but his no powerful being.

Yeah I wasn't a big fan of cap hogging mjolnir like it was his hammer. It just undoes the moment of happiness thor has when he realises hes still worthy.

*stormbreaker

Not at all true!!

Just because someone held an infinity stone doesn't mean they can lift mijolnir...

For example, thanos did not actually lift mijolnir, he just held cap's hand!

Besides, in order to hold an infinity stone you must be strong and powerful, but in order to lift mijolnir, power isn't enough, just as we saw hulk struggle to lift the hammer in the first avengers movie. In order to lift mijolnir, you need to be worthy. Besides, Peter Quill held an infinity stone, and he never summoned mijolnir.

Not everyone can lift stormbreaker.

Captain america is one of the only powerful avenger which his power comes from not only a suit or body, but his power comes from his will and soul.