Is it normal that i have almost constant nightmares?

I am a 20 year old girl . I have vivid nightmares 90% of the time.(Yes 9 out of 10 nights, sometimes more) The rest of the time I have random dreams This has been occurring since last summer- July I believe. By nightmares I mean torture, rape, murder, monsters etc. For example once I chopped up this woman and buried her. Another one is I was brutally anally raped by my ex. Another is I was stabbed to death. A horrific monster almost ate me. I had sex with my brother. Someone bit chunks out of my flesh. My mom died. I was partially skinned. I was stabbed getting off the train and watched my blood pool out. My boyfriend was killed in front of me and he died in my arms. I was tied up naked, whipped and gang raped and then told the real torture would start next. That's just some of what I remember. There are other dreams I have purposefully blocked out because they were too much to handle, so I no longer remember them. umm I'm sorry for the rant I find it a lot easier to rant by writing. I write a lot, it's how i get stuff off my chest. Oh and all these dreams are in 100% full f@#$ing color. I can't say I have gotten used to these nightmares because they never repeat themselves. I really hate the rape dreams because it sometimes makes it hard for me to touch my boyfriend and stuff. Which sucks because we are both very cuddly people. :) Thankfully he is so amazing and loves me so much. It's awesome living with someone who you love. Sorry, I went off topic there. Even if I am not thinking at all about the dreams I may have I still dream. I have not sought out counseling or anything like that. I am a stressed out person by nature and have low self esteem and sense of self worth (apparently, the last two is what pretty much everyone I know has told me to work on). I have tried several relaxation ideas...hot baths,sex, massage, a ridiculous amount of cuddling. my favorite tea, relaxation and sleep-time tea, and just in general being as comfortable as possible. I have also tried taking melatonin...did nothing. I am at the point where I dont expect it to stop. Anyway any advice would be much appreciated. Please don't be a jerk. Even though no one knows my name or anything it was still hard to post this.