The line from the head of your penis to your scrotum is perfectly normal. The yellow/white stuff under your foreskin is normal too. It's called smegma and it's a good idea to clean it as much as possible. As for the connector preventing you from retracting your foreskin all the way... if it's uncomfortable for you to retract fully because of this, it might be a case of frenulum breve. It's a condition that is easily treated with a visit to the doctor.