I have 25 years and i've never had sex, although i've masturbated and all that, i started experimenting with fingers but i can't introduce more than one, because it hurts so i can't make the second one enter. is it normal? i can introduce tampons?

It is not uncommon for women to experience pain or discomfort during vaginal penetration, especially if they are not fully relaxed or aroused. This can be due to a number of factors, including anxiety, lack of lubrication, or a medical condition such as vaginismus. If you are experiencing pain when attempting to insert more than one finger, it may be helpful to try using a water-based lubricant.