Erection problem. Since last 8 years!

You are just 20 . so the chances of having any problems are less. It may happen that your erections are not harder if you are not emotionally involved. Also if you are masturbating to porn or are a very frequent porn watcher, the porn makes you to have a higher level to get aroused. Hence when you feel like having sex the stimulation provided by the "real" partner is NOT enough to give a hard erection. Erections need NOT be hard like bone, but they just need to be firm like the "tip of our nose" to cause en entry into the vagina. Erections happen due to increased blood flow to the penis. If you are distracted, or are having fear of being caught or are feeling intense pain at penetration, this can make the erections less hard. Habitual masturbation can also raise the level of stimulation required for sexual arousal and erections. Morning erections happen when you get up refreshed after 6-7 hours of sleep. if you are waking late into the night due to whatsapp chats or other activities, and your sleep is disturbed, then you may not see the erections.

Masturbate only when you are aroused. Habitual masturbation is BAD and it can cause harm to your penis. Do NOT masturbate as a habit before sleeping or daily. This makes the penis get used to lots of stimulation and hence when you are with a partner for sex, the same stimulation is not available.