If it takes effort to lavish the well-deserved praise, then you may be exhausted and/or drained.
If their personality is demanding, then it may be frustrating and/or a colloquial P.I.T.A.
If you're wishing to be recognized for your own talents, then it may be humbling.
If their talents are prompting you to reflect on your own inadequacies, then it may be humbling.
If you're outwardly happy for this person and inwardly jealous and/or your feelings are a storm of unsettled emotions and you need a polite way to describe how you feel, then it may be politely said that it is humbling.
Finally, if their talents are causing you to doubt the amount of your own personal agency, then it is discouraging.
Related concepts: Limelight, the focus of public attention and common object of rivalry.