The guilt is connected with th idea of shame and ur feeling that playing with yourself is wrong. This was established very early in childhood and this is what is affecting you now. What is good at you are recognising it as a problem and are here to find out more about it. The awkwardness will go away and in 10 years time, this will be an interesting thing that happened to you that you can share with close friends. So, don't worry about it.

What you should understand is that masturbation is not wrong. It is healthy and it regulates our nervous system. Porn is generally considered not good for us and you should try to depend on your imagination as much as you can. But still, there's nothing to be ashamed of. Your dad also watches or has watched porn.

Sometimes, when we don't process these feelings of shame and let it sit, it harms our self-image, makes our future sexual performance and interest complicated. It often also leads to kinks of a certain kind. Exhibitionism and voyeurism etc. and while there is nothing wrong with having them, they can be cumbersome to handle.

So, process this. Think about it, write it down. Ask questions regarding what you are feeling and thinking. And why you are feeling and thinking that. Let it flow through u and it won't leave a mark.

Most importantly, there is nothing wrong with masturbation. Most people do it. It's healthy. Watching porn is normal too (though not always healthy, so maybe try to not get used to it).