It sounds to me like you're in such a negative headspace from not having your expectations met right now that chances are good you're not going to feel very satisfied no matter what you do. I know, another WTF thing: in order to feel less frustrated, you're probably going to have to -- yep, you guessed it -- figure out how to feel less frustrated.
I'd suggest you take a little time away from trying, like Mo suggested. Give yourself time to get an escape from all these hard feelings and bummers, and time to focus on other parts of your life. Then maybe take some times where you let yourself get excited (or explore more in your head to figure out what gets you MORE excited) before you try masturbation again. See if you can't maybe teach yourself to stick with your imagination some more -- sexual fantasy often is a big part of many people's solo sexual lives (and or plenty, also with partners), and see how that goes. Maybe see them how focusing on your external clitoris, which it sounds like you've had more success with -- and does tend to be how more people with vulvas masturbate than with vaginal entry stuff anyway -- goes.
If you feel like you have been super influenced by what porn presents as satisfying (which is most often not realistic), maybe taking a break from that to give yourself time to explore on your own, even just in your imagination, is a good call, too. If nothing else, porn tends to make it seem like the ONLY sexual parts of bodies are genitals, mouths and breasts, and that's just not at all true, and focusing on (in your head, per what you're figuring is what's erotic, or in action, with your hands or toys) those parts alone might be part of the issue. Porn also rarely shows anyone who doesn't need some real time to get turned on before they even start anything sexual, which if you're not taking, could be part of why things feel so meh to you.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead