Problem with ejaculation

Patient: Hello I am a 21 year old male and have been experiencing some problems with ejaculation. Starting two weeks ago the feeling of my orgasm and ejaculation changed significantly. It now feels dull, desensitized, and more like releasing pressure than what the intense pleasure I was accustomed to experiencing. I am producing semen but it is watery and seems to be less of it. I am wondering what could be causing this and what I could do to solve the problem? Thank you.