Am i bitter?

You're female.  I'm guessing you're not disabled, know how to practice acceptable hygiene and can walk and talk at the same time.  You might not "easily" attract the kind of guys whom you're also attracted to, but as guys have a much, MUCH higher sex drive then women, you will have better luck than many men in your position.

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Well that is your first problem that you are jealous of your friend. Maybe put yourself out there a little. Maybe even make the first move or become more approachable 

Not bitter, just unhappy and bored.

It's simple your turn yet. You are growing up. They will observe a swan twisted from an ugly duckling. Besides, buys are also growing up. They will shift their interest soon.

But every group of people has a different level grade. You should enrich yourself.

Your bitterness will turn guys away.

Men are attracted to lovely women.  But the women they APPROACH are the ones who feel good about themselves and are also warm and friendly (and therefore approachable).

Don't compare yourself to others, and don't measure your worth in comparison to others.  There will ALWAYS be someone who seems better than us ... AND someone who WE seem better than.  Don't compare .. learn to accept yourself, flaws and all. And then focus on helping and caring about others, because the more we focus on us, the more neurotic and unhappy we become. And others can sense that and it will turn guys away from you.

If you want people to like you, you need to like yourself AND to like others too.

What makes you think you can’t ? Guys are very simple creatures and while a lot may seem to be attracted to your friend, I bet if you put yourself out there, just as much would you also. Guys are humans to and all have different types. Don’t sell yourself short or dim yourself because you worry your friend is more capable with guys than you.