No shame, but it will make you feel guilty. After all, you graduated from a key university and do the same job as a civil servant, but your income is only about half, which shows your unwillingness. But now there are many people with the same education as you who work in the unit and have a good life. Because there are such people in my unit.
In other words, even if you graduated from Tsinghua Peking University, you are admitted to an ordinary undergraduate degree, so do you have a gap?
Therefore, as long as it is a job that you like, it is worthwhile. In addition, you can ride a donkey to find a horse, and then try to get into the civil service. As long as you don't give up, your goal will come true one day.