I have injured myself a lot of time during exercising, and I didn't even notice. just after that I finished that "what the fuck is that? blooooooooooodddd????? "

Someone might not know what the hell is that. This is a protein. One of my favorite part of the whole body.
Everybody can easily get it.
*****copy & paste*****
Chocolate. There may be a physiological reason we crave chocolate when we are feeling blue. Chocolate contains chemicals called N-acyclethanoloamines that reportedly boosts endorphins. Stick with high quality, dark chocolate.

Acupuncture. Some research suggests that the reason acupuncture is so effective is that it causes a release of endorphins.
Exercise. Numerous studies have shown that exercise stimulates endorphins. Heavy weight lifting and sprinting are thought to have the biggest impaction on endorphin secretion. Prolonged aerobic exercise can also lead to the famed "runner's high" - a possible product of endorphins.
Sex. Orgasm releases endorphins. In an interview with iVillage, Alan Hirsch, MD, neurological director of the Smell & Taste Treatment and Research Foundation in Chicago points out that having sex is a lot easier than going for a long run.
so yeah probably I didn't felt it because of this. I actually adore sport. Even if I get hurt. I would still do it if I could. **see below**
I just have to overcome of my fears. I am not brave enough to do those things. how pity