Speeding and turning at more than 100kph is a very powerful thrill, it helps you get your mind off shit, but it is irresponsible in the sense that you risk yourself, your dad's car and any other road users out there. I've done it once very recently when I was in a similar situation, felt good but I told myself to never ever do such a silly thing again.
Just forget about it. Think of yourself in the future, looking back at yourself now and how pathetic you'd seem. This should make you want to force yourself to move on. The emotions will come back randomly, when you're high or when you can't sleep at night, just gotta learn to keep it all in check.
Like a few have said, crying it out works. Like if on one night you feel particularly depressed, just punch or hug your pillow tight, shout, whatever, and do it till you fall asleep. The next morning you should wake up WAY stronger than before, at least that's how it seems to be for me. But if it's happening every night, then maybe seek a higher level of help, spiritual, counselling, or anything that can be deemed fit.
Girls who f*ck guys up aren't worth you devoting so much of yourself and your emotion into.