Not just immigrants, most Germans pay taxes for very little in return while bureaucracy keeps growing.
You are getting downvoted, but it is true that young people are getting a very rough deal, and a lot of the people in my circle are looking to emgirate. Friends from other countries and students (mostly know them through academia), are also not looking for long-term opportunities here anymore, which was different 15 years ago.
I would be far less annoyed with paying very high taxes and social contributions (around 50% of my income), if the services provided worked. But this just hasn't been the case for me. The healthcare system is close to breaking apart, and after moving to a new city 6 months ago I have been unable to find doctors willing to take me in. Childcare is constantly closing down due to staff shortages, buying a house is unrealistic unless both partners have good jobs or you inherit, and the jobs market is incredibly rigid and inflexible.
Every single one of these points are worse for young people then for older ones, and the only thing the government seems to get done is giving weapons training to young people and gifting pensioners 180b$/year extra.
If that makes you feel any better, this is also very much the case in France, actually, it's probably worse.
But I think it's a general trend in Europe and much of the western world who went all in for socialized everything/government control.