Can stopping masturbation affect my ability to get an erection?

It appears from the symptoms you mention that something does not work well because of pain and bleeding which happen every time after having sexual intercourse. A UTI or an STI may be the cause of this. UTIs are infections that happen in the body's urinary tract, while STIs are infections that are transferred through sex. The most common symptoms are pain, burning when passing water, and bleeding. It is very important to see a doctor to make sure you're diagnosed and receive the proper treatment fast. Also, remember to always use protections during sex for instances of contamination.

Ureaplasma and mycoplasma are microscopic bacte­ria. They pass from man to woman during intimate contact. These­ bacteria may cause symptoms in women. Pain while­ peeing, odd discharge, pe­lvic discomfort. Both partners should get teste­d. If positive, take antibiotics. 

If there was any precum and you put the condom on inside out but then flipped it, there might be a small chance of pregnancy, but it’s not very likely. It’s only been 5 days since that happened, so it’s too early for her to have any signs of being pregnant. To make things even safer, suggest to her that she should use emergency contraception such as the morning-after pill. This will stop the egg from being fertilized. Also, just to be cautious, watch out for any unusual symptoms in your partner within the next few weeks like missing a period or having strange bleeding. 

Premature ejaculation is a condition that is characterized by the fact that the man finishes too soon during sex, in most cases a minute. The most common symptoms are the quick finish, the stress, and the avoidance of intimacy. Causes can be anxiety, excitement, or bad experiences that one has gone through. Don't panic, there are ways to help, such as breathing exercises, changing positions, or talking openly with your partner to reduce stress.

The pre-ejaculation fluid may contain dry sperm, which is likely to bring about pregnancy in case the condom breaks. A delayed period can be a symptom of pregnancy, however, it may also be the result of stress or other causes. In case of a broken condom, it is advisable to seek emergency contraception to prevent unintended pregnancy. Monitor any early signs of pregnancy and think about taking a pregnancy test if her period is late. 

Excessive masturbation may cause erectile dysfunction. Consult a doctor immediately

It's good news that all your HIV tests came back negative after the risky encounter. However, you should be aware of the fact that sometimes it takes time for HIV to develop and to get detected by tests, so it is advisable to get retested after three months just to be sure. Always use a condom to lower the risk of infection both for yourself and your partner.

At your age, it's normal to feel curious about masturbation. Masturbation is safe and healthy. It won't harm your circumcision recovery. Just make sure your hands are clean to prevent infection.