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I am scared I am not able to have children...
I am 18 years old and I have a 19 year old boyfriend never ben on any sort of birth control ever!. and since 12/25/07 I had lost my virginity for the 1st time to my boyfriend of 8 in a half months and since the end of feb we have been trying to have a baby. And I can't understand why my periods are regular and for the most part always have been... but for some reason I can't get pregnant. =( and its heart braking... I have took internet advice friends,family,everyone's advice on how to get pregnant and I still can't after almost 4 in a half months of trying...

I would see a doctor. There are plenty of things they can recommend, and they will be able to tell you what might work better for you specifically.

Of course first realise that often while some people get pregnant on the first time even using birth control, others can take up to a couple of years, even following timming methods. So first stop your doctor for you and boyfriend to be checked.

I do have to ask at 18 why would you want a baby so early in your lfe