Are there too many stars in the universe?

Yes, No or Maybe.

As we do not know how many stars there are in what we call 'the universe' and as their number can only be regarded as too few, just right or too many if any of the competing theories of the formation and evolution of the universe agreed to any significant degree.

It is believed that less than 5% of the universe is what we might unscientifically call 'real' matter (stars, planets, gas clouds, etc.) the remainder being 'dark matter' and 'dark energy' of which very little is understood - though many theories abound.