The Trouble With Masturbating

So, here's the thing. I get this fantasy going in my head and it gets me hot. I start masturbating (specifically clitoral masturbation, that's my thing) and it's gets even better. Only when the feeling gets super intense my mind (or my body, I don't know) sort of shuts down. It's like my mind/body just says, "I'm done." But I want to keep going! I don't know if I'm mentally blocking myself from climaxing or feeling any real pleasure.

I do feel a bit embarrassed sometimes. Especially when I go to fetishy territory. I was raised in a religious family that is against premarital sex and masturbation. It doesn't stop me though.

I have no clue what to do. I've thought about getting a vibrator but I don't want anyone to hear me while I use it. My house has super thin walls.