I know how you feel. I have been there too. Well, the steps you need to take depend on were you are at the moment. It al depends from individual to individual. What works best is a CBT (cognitive behavorial therapy) approach. But if you want some advice of how to help you get over it, I need to have more details of the problems you are having:
Are you afraid of talking to strangers ? Or are you only afraid to talk to women ? Or are you only afraid to talk to hot women ? Or can you talk to women, even if they are not, but you are scared to ask them out ?
There are 2 things you need to do:
1. Change the way you think about the world. If you think you are not worthy, or she is too hot for you, or you can't talk to women ... change that way of thinking. If you are scared of rejection ... reframe rejection. It is not about if she rejects you or not; it is all about if you can express your feelings to her or not. Also, not all women will like you and you will get rejected. In fact, the guys dating the hottest women have probably got rejected 1000 times more than those dating an ugly woman. If you want to be a player, you will get rejected. But that's OK. There will be lots of women too that like you, even really hots one. So approach and go find those hot women that like you.
Try to read some inner game stuff. This can also help you change the way you see the world.
2. You got to approach. But in small steps. If you are scared of speaking to strangers, please don't even try to go up to a HB9 and tell her she is cute. Your emotions will blow you away; you will not approach; you will feel horrible about yourself and your AA gets only bigger. Try to do something that scares you, but not too much. If you have social anxiety, just try to ask directions to a man, or an old man. Practice this on a daily basis. The more you practice this the better you become at it. If you feel reasonably comfortable about this, try to ask directions to women you are not attracted to. If you feel comfortable with this, try asking directions to women you think are hot. Next time try to compliment a less attractuve girl about something she wears ....
You see ? You need to practice consistently and always make it more difficult but not too much. Always take small baby steps. If you do this, you will get over your fear.
And a great advice I can give you ... don't wait too long with solving this problem. Don't think that by reading stuff behind your computer you will conquer this issue automatically. Get off your lazy ass and go approach people in the real world. Don't make the mistake I made. I waited too many years to go in the real world. While I did that, I made 0 progress. I started to make progress when I decided to go in the real world and approach.
Whatever approach you make ... be proud of it. If something as silly as asking directions is difficult for you ... but you manage to ask directions ... you should be proud of yourself.
You are young. Fix your problem NOW !!! You can get cured much faster because you are still a teenager. I started fixing this at age of 30 !!! I suffered a lot because at that age it is hard to change your thinking patterns. And if necessary ... GET HELP !!! Maybe you need someone to guide you with this. If so, then do it !!! And if possible, even discuss your issue with your parents. They might help you with it.
Good luck !
would the 3 second rule help?