Hello,
In your case, it looks like you are not able to orgasm because of psychological causes. Changes in the hormone levels can also cause dryness of vagina and hence anorgasmia(lack of orgasm). Other causes are stress and anxiety, alcohol and drugs, relationship issues and medicines like blood pressure medications, antihistamines and antidepressants.
Talk to your partner openly about any fears or apprehensions, eat nutritious healthy food, exercise regularly and cut down on smoking or alcohol if you are taking it. Also ask your partner to indulge in plenty of foreplay or use a water based lubricant. If still a problem, then please get your hormonal assay done form an endocrinologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Be patient. Don't try to rush it. Why don't you try watching porn while you masturbate. Give your mind some stimulation. Works for me! Lol x