I haven't had my period in 6 mos. obgyn said i was not preg. this is a normal occurance to go w/o for awhile. does this mean im infertile? im nervous

No but needs eval: It is not unusual for a young women to skip her menses at times. However it is important that it be evaluated when it has gone on for this amount of time. Some hormone are in the car in problems can cause a woman to skip her. Such as thyroid disease or pcos.It would be important to clarify if you have other symptoms such as excess hair growth or obesity. Please see your doctor.

Get checked out: No period for 6 months means you're not ovulating regularly. See an ob/gyn or a reproductive endocrinology (rei) physician to find out why: pcos (polycystic ovarian syndrome), thyroid or prolactin problems, low egg supply, or low hormone levels from exercise, stress, eating disorders etc. If not ttc you can take birth control pills. Depending on the cause it may or may not affect future fertility.