When could I start my sexual life again after giving birth its been 3 months already but im scared to have sex?

ASk your doctor! Women can usually have sex again after a vaginal birth right after their 6 week checkup. It is important to talk to your doctor about why you are scared to have sex. Your OB doc could probably reassure you that it's normal and natural to start having sex after childbirth.
Now. . You can start now. You may have some pain at first depending how your delivery went. Just take it at your pace and make sure your partner knows you have to be in control.