I understand your fear, it is one of those things as women that we all have to do, and if you explain it is your first time, they will be more than happy to walk you through it very gently. I promise the anticipation is the worst part, once it is over with you will be so relieved, and having that first visit behind you will get those first time jitters over with too.
Have a friend or your mom go with you, but do get in to be seen. Bleeding that long can lead to other problems, and you will be back on track real soon. I can tell you that I am 50 years old now, and going to the female doc is a piece of cake for me. The exam itself is very quick, and it's all over just like that. I am sure you will do just fine, just try to get in as soon as possible.