Idk what to do

I know this isn't the place for this, but I'm desperate. Sometimes I get very very unwanted and repulsive thoughts. I think about sex with almost anyone I see. Do I WANT sex with everyone I see? Hell no. I think about, while standing on a bridge, hurling my phone into the water. Hurling myself into the water. It scares me. Sometimes I think about killing my dogs. I love my dogs more than anything ever and I hate myself for even thinking about it but I can't help it. This whole thing bothers me so much because I think I'm actually a good person. I would never do anything bad. I'm scared of myself at this point and I'm so so repulsed by my thoughts.

Is this my fault and how do I make it stop??

Please. Anyone. I just want it to end.

I'm 14.