Weird sensation in the penis head during ejaculation and barely ejaculate inside a vagina

[Nafsy]

Hi everyone. I'm 24 now and I masterbate regularly. I'm cut and during the time of sex, when I feel that I'm going to ejaculate and it's coming, I have a weird sensation in the penis head which leads my ejaculation away. I enjoy the vagina and my penis is erected hard but i feel a weird tinkling feeling in the penis head when I'm about to ejaculate.

When I masterbate, I'm doing well because I just use the skin of my penis and i do not touch the head too much. Another thing to mention that I do not use underwear.

Please give me some advice.

[Nafsy]

Thank you