:( why I can't get pregnant after mah boyfrind ejacuated in me many time

Ettng pregnant depends onther things also not just the guy ejacuating in you

You may have some prezygotal barriers stopping you from having children. Could be the wrong time, Could be his sperm, could be your egg... the list goes on.
Have you seen your doctor about it yet? They can usually figure out what it is and suggest ways to fix it.

Getting Pregnant - Signs of Pregnancy, Ovulation, Conception

This will give you a start, although you should have had a little sex education by now - to include the risks of getting diseases if you are not sure your partner is STD free. Also, before taking such a big step, you need to consider all that you give up in your own life and whether you are willing to do so.

Don't just get pregnant because 'everybody else is doing it', or think it's a way to get away from a home that stresses you out.

Think seriously about all the responsibilities.

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Getting pregnant is more difficult than just having sex. It takes the average healthy couple 6-12 months or longer to get pregnant. You need to educate yourself on getting pregnant, being pregnant, and having a child. Talk to your doctor. He/she can give you all the information you need.