How to feel better about myself?

My sister has this friend who's staying at my house for over a week, and she seems to be eveything that I wish I was. So in other words, I'm really depressed about myself. I don't know what to do with myself. I don't want to deal with this anymore. I want to talk to my mom, but she has 7 other kids, a home business, and my brother's wedding to worry about. So I don't want to stress her out anymore. I've been sitting in my room the past hour crying and trying to do what I normally do to make myself feel better about myself, nothing's working. So I really need to know, how can I make myself feel better about myself??

PS... I'm not going to cut myself or commit suicide, so don't put anything like that down.

For starters, why don't you read your bible if you go to church.
I know that you envy your sister and all that, but, you need to do things to be more yourself. Like, go for a walk, watch a favorite TV show, read your ibble, attend church, hang out with your friends or the rest of your family, or have someone take you for a drive, or else, if you drive yourself, take a drive someonewhere to get your mind off of these things.
If you can't talk to your mom which sounds like she has her hands full, talk to your Pastor from church, or maybe a close friend, or possibly, another relative in your family.
I myself wouldn't think that you would be the type to comitt suicide or cut yourself. You're just not the type.
I'll leave you with a word of prayer:
Heavenly Father, please touch this user's heart for comfort, healing, strength, and counsel. I ask thee that he or she could learn from thee and to feel your warmth and gentle heart. Bless him or her as this person goes through trials in life and to hope that he or she get the guidance and counsel from thee, I ask these things in the name of Jesus Christ amen.

just pamper yourself I guess.
Try to do things that show your strongpoints, and maybe it will make you feel better. I have a friend like that. Shes athletic, musical, can sing and dance rilly good, shes pretty and smart. her parents have moeny and she leads a perfect life. I just get past my jealousy by doing things that only I can do.

do wut you like 2 do, I've been deppressed before. used drugs im off all drugs now, and I feel a whole lot better:D:D:D

Hope this helps you:
http://depression.about.com/od/faqs/FAQs.htm

You can always try to be her friend and get to know her a bit better. But you don't really need to compare yourself to her. You're special, and no one else is like you... Remember the saying 'The grass is always greener on the other side'. She probably think you're cool too!

hook up with her boyfriend then you will know and feel that your better or just dont be so jealous...

retail therapy!
try a new look if you arent happy with your current one.
pamper yourself a bit!!! get a new haircut.