You should see a doctor. There are different reasons why the foreskin can get tight. One is infection and antibiotics can clear that up. There are creams and gels the doctor can tell you about that can help loosen the foreskin as well. A lot of times it is a hygiene issue that causes this so pay careful attention to how you care for it. Gently pull the foreskin back and move it around bit by bit to loosen it. This link has how to stretch it. https://www.healthline.com/health/how-to-stretch-foreskin#precautions Circumcision is not complicated or horrible for adults. So, talk to your doctor. But you may be able to solve it with these other things.