I’m so upset i can’t cum

Sounds like you may be a lesbian. The signs that make it seem to me are 1) your boyfriend can't make you come, but masturbation does, 2) you hate masturbating with dildos, 3) you said most penises are ugly to you, and 4) you said you watch porn for the girls, not the men. But, you saying how sexy your boyfriend is and that you fantasize about him makes you sound like you're straight too. I guess you may be bi. Just saying, but that's cool, I don't mind bi women and women on women sex at all.

Please don't say that you suck. Many girls have challenges when it comes to orgasms! Some have never even masturbated and never had orgasms during sex. Sad to say that I've had women tell me "I didn't even know I was supposed to orgasm during sex! I thought it was all for the man's pleasure."

Others even take pride in their unwillingness or inability to cum. Sometimes it's referred to as being "new in box".

And then certainly there are orgasm denial/chastity kinks.

But it sounds like you're saying that you can orgasm, you just don't during sex. As others have mentioned, that isn't terribly uncommon for women in quick, basic intercourse with a man. Perhaps you need clitoral stimulation. Perhaps you need to discover your kinks and indulge in something that becomes a huge turn on for you. Perhaps it would be easier with someone else, or in a threesome. Perhaps you need foreplay to really get to the point where you're ready to enjoy sex.

But don't feel that you suck. Any problem you've had, countless other people have had. It's something to learn from and work on, that's all, and you can't be blamed. Think about it and try some new things. Explore your body and your interests.

It's possible that not even the delicious D***** can ever _make_ you have an orgasm, especially if all he's doing is penis in vagina sex.

Surveys have found that only around a fifth of women are capable of reaching orgasm via solely vaginal intercourse. For the majority of women, the clitoris is just a little too far from the vagina to be consistently stimulated for long enough for an orgasm to occur.

The fact that you can reach an orgasm when flying solo is a good start - some women never learn the knack of doing even that. Think about how long it takes you to reach an orgasm when you're doing it yourself compared to how long D***** is doing his thing. I wouldn't be surprised if you find that he's over and done with it much faster. It's normal for women to take anything up to 20 minutes to get to orgasm from a lukewarm start, while men can make that journey in less than five minutes (sometimes a lot less).

It's a truism that, if you're convinced you suck at anything, then it's very likely that you're going to suck at it. It may be because you truly do suck, but it's possible it's a self-fulfilling prophecy. Some people are very good at self-sabotaging.

Also, if you're so in your own head when you're having sex that you're worried about how you look and how you sound and if you're doing the right thing, you're never going to be able to be fully in the moment and experience. Sex isn't about thinking; it's about experiencing what's happening to your body and how the other person is responding.

Porn stars notwithstanding, most of us look and sound pretty fucking weird when we're totally into sex, and if it's as smoothly choreographed as a porn video, then it's probably pretty damn boring sex.

Have you considered the possibility that, no matter how hot you think D***** is, it's entirely possible that he's simply a crap lover? Just because someone is gorgeous, that does not mean they're going to be great in the sack.

Get him to fuck you in the tub, so if you do feel the need to cum like you would when masturbating, there's a contained space for it to flow into.

Just that added security should help you to relax enough to cum

What is d****? & also all penis are ugly but girls still put them in their mouth Idk what will happen if it starts looking pretty😂.
now for the advice "sorry I don't have any"

With your last words, saying "I suck", do you mean blow job or do you mean you're saying that you're terrible?