"Normal" is a relative term. What is normal to one person is not normal to another. Feeling jealous of someone for whatever reason is a sign that something else is going on. Jealousy tends to point to an insecurity. Is your friend getting more attention because she is prettier than you or does she seem more confident than you?
You see your friend's beauty but do you see your own beauty? If she is "just as pretty" as you, then you must be just as pretty as her. Take a step back and look at how comfortable she is with other people. Are you just as comfortable as she is? My guess is probably not.
Instead of comparing yourself to her, start focusing on all the wonderful things you have to offer this world. You have beauty and talent and a special gift that is all your own. It's up to you to find that and focus on that and start appreciating yourself. Once you are able to appreciate who you are, you will no longer feel jealous of your friend. Or of anyone else.