Suffer from anxiety and depression?

Everytime a girl tries to talk to me i get nervous and just say hi and walk away. What should i do?

I won't say it's not anxiety. It could be. There's no way of knowing just from reading this. There could be other things going on that you're just not mentioning and you just mentioned this because it's the most recent thing that's bothered you. Remind yourself that you CAN have control in this sitution. Think about turning the tables, like....ask her a question of some sort. This takes the attention/ pressure off of you for a little bit because she actually has to think, then answer. After that, just try to go with the flow of the conversation. If you get nervous again when it's your turn to talk, try to answer the best way you can, then turn the tables again and ask her something else. The goal is to get to a point of somewhat comfortable conversation as you go back and forth. Sometimes, it just doesn't work because some people may just give off a vibe that is uncomfortable for your personality. In that case, you might not want to be friends/ dating anyway. Other times, it works really quick because the other person just makes you feel at ease. THAT'S A GOOD SIGN.

I wouldn't call that anxiety or depression...more like shyness. Just say hi next time stay put and wait for her to reply and ask a common question like so what's new with you or how have you been...once the conversation is flowing you will loosen up and feel more comfortable talking.
Take a time to breath or count back wards from 3 slowly then just say hi how are you? practice it in front of a mirror if you have to untill you feel fine with it. Also if you want to get the conversation moving ask her about school/family/hobbie e.c.t they usally do one of those so its an easy option to start conversation. but overall i think you need more help than yahoo answers like therapy or something good luck
Most important, smile! Take a deep breath if you feel nervous. She's likely not expecting you to recite Shakespeare sonnets for her, she's just trying to get to know you.

If you're nervous about talking about yourself, ask her about herself. Most people love to talk to about themselves.

The nervousness will pass with time, with experience, and with growing confidence.
I think you are just nervous. Do you have feelings for her, or are you maybe intimidated?? Just take a nice deep breath, and say hi. Then just try to put fear past you and start a convo. Take baby steps, and you could end up being great friends!!
Panic attacks, vomiting, that is anxiety......
why do girls make you nervous? ....have you ever thought of that or any reasons at all...for you might be hurt by a female or females in the past...be she your mother, sister, classmate, or sibling, etc...you need to explore into your problems regarding the opposite sex...that's where your nervousness and anxiety came from...and try to reduce your anxiety one day at a time...so girls will not intimidate you no more...