Is it normal to have such extreme sexual fantasies?...

First of all I'm a girl even though it says male..i think. idk. I'm really sketchy about all of this right now.. Anyways, it really started with sneaking porn and learning how to delete the history fairly quickly (since the computer was for the whole house to use). This was around 13 or so and it was okay at first. Nothing too extreme. As years went by (I'm 19 now), it picked up and I started looking into unusual fetishes that most people would consider normal to look at: bondage, domination, spanking, etc. But one day I was on my current significant other's computer, I saw that 'beastiality' had been written into a search engine. I snooped a little further and I found they were reading stories about peoples experiences with beastiality. Clearly I thought nothing of it because I'm still with this person. But it got me thinking. So I searched it, explored it, and found it interesting. I felt very ashamed the first few times for even looking at it, but it faded after a while. I am still completely incapable of bringing myself to actually fufill any of these thoughts <--if this helps anyone in giving me advice... So it started with beastiality.. then seeing one video referencing another I was opened up to more strange things. Like monsters. Werewolves, aliens, and other made up creatures. That turned into virtual/ hentai. That turned into rape/forced sex, turned into forced sex by someone in the military, turned into etc, etc, etc. I have been opened up to so many things. And I am completely fine if someone else were to come to me with these fantasies as long as it doesn't control the person's entire life. Like I've looked at furry porn before, but I can't understand how some people devote their whole lives to it. And lately I've been looking at incest (specifically father/daughter) but I personally could never do it with MY father.. I cringed at the thought. It's just the thought of seeing some other attractive father and daughter doing it. And older men. REALLY older men. Like women in their thirties and men in their seventies. I didn't think it too odd to be honest because just think about how many stupid fucking celebrity couples there have been where the guy was 70 and the girl was 35 or something. But then again I guess thats where the thought came from. Now I know that some of these are completely strange and illegal acts.. I also know that this is a long post, but its been weighing on my mind for so long. Can someone just please tell me if anyone else feels the same way? I have such odd fantasies, and my significant other used to as well I guess.. but I'm still so afraid of telling them. And I have a dog, but I would never be able to actually do it to my dog or even let him do it to me. And I feel like if I told my significant other, we would both be very uncomfortable around the dog knowing what was just discussed... My dog has been around more than once or twice while I was having sex and I stopped because he would hop up on the bed or start growling because he thought I was hurt or something. Or even jealous of the attention I don't fucking know lol. I'm just really worried that I need to see a therapist or something... I am extremely ashamed of all of this.. but I can't be the only one..