Instead of taking a knife to your arm, take a pen. Doodle. Draw out anything and everything, whether a vent or something else to express yourself and how you feel. This way, you will be left with a creation rather than scars for others to witness and judge. Keep your head up, things will get better. Keep trying and never give up.
After the rain comes a rainbow, and every gray cloud has its silver lining! Sometimes, it just takes time or another perspective to discover the up side of the situation.