I have a long penis everytime i try having sex only the tip goes in what can i do );?

Thank god every day: There is no reason that penis size is preventing you from entering a woman's vagina. She may not be lubricated enough, or she experiences pain, which causes vaginal spasms. I assume your penis is straight, since extreme penile curvature can prevent intercourse. I suggest you both see a doctor together to find out a basic mechanical problem.