Am I permitted to offer sexual services on my own?
Yes. To do so, you must be at least 18 years of age and meet the legal requirements.
If you are under 18 years of age, you are not permitted to work as a prostitute. Sexual acts with minors in exchange for money are a criminal offence in Germany (“sexual abuse”). Persuading minors to engage in such acts is also a criminal offence.
No one should force you to sell your body for money. Forced prostitution and pimping are criminal offences.