Okay so I need advice and some help ;

My mucus plug (or what I think is my mucus plug) has been coming out in larger pieces for about two weeks . It's a yellow clearish jelly like mucus but I haven't had any blood in it . How close does this mean I am to giving birth ? And I'm so worried about giving birth like can someone explain in detail what an epidural is and if it stays in your back for the whole labor process ? Does this mean you don't feel the baby coming out ? And do they have to give you a catheter to empty your bladder ? How much does that hurt and does it stay in the whole time ? I used to be so excited about giving birth and now I'm like extremely nervous and it makes me feel like having a panic attack . I need someone to give me good advice and make me feel encouraged again . I'm 21 and like terrified at this point and I keep getting pains when I stand up after sitting down , their where my ovaries would be if I wasn't pregnant is this normal ? HELP ! Lol