HELP Fussy baby 👶🏻 ⁉️

My baby boy is always fussing and crying. He never seems happy in a position for very long. He’s 5 months old and not yet crawling but can hold his weight up with his arms. My husband and I put him in the walker, activity gym, swing, play mat, bouncer and even hold him up for a bit. We give him baby rattles, teething toys, piano toys that light up but he never lasts more than 15 minutes. Is this normal???? My sister said her baby would be entertained for hours by himself. My mom and siblings say my baby is difficult to take care of and is a handful. I’m so embarrassed. Help!