First of all,no,you don't need to release liquids/fluids from vagina for reaching climax! Some women do squirt,but this is not necessary for reaching orgasm!! However,vaginal walls keep releasing liquids and get wet when you get stimulated! Usually,this liquid release process starts when a female gets stimulated/prepared for sex/gets horny,etc! Contractions of vaginal wall are mostly connected with female climax!
How do you define "climax"? I mean,how do you know that you will reach climax? What type of physical sensation do you need to feel to understand that you have reached climax?
I'm asking these questions because it seems you are connecting physical sensations with the descriptions found in sexual stories!!
You haven't describe your process of masturbating!! Which part of sexual organs do you use for masturbation-is it vagina or it is clitoris? Note that some females have difficulty reaching orgasm/climax through vaginal stimulation only!! Some women just need clitoral stimulation!! Some need to use both vagina and clitoris for reaching orgasm!! You need to check out and experiment with your body to find out which one works best for you!!!
A female's ability to climax usually improves with age. May be,you need more times....
Go slow. Know your body and mind!! Stimulate yourself on mental level!! Female's sex is deeply connected with mind,too. A female needs to be mentally stimulated! You just can't jump,and start doing it,and reach climax everytime!
If it is causing vaginal pain,that means you are putting too much stress on your organs!!! Looks like,you are trying too hard!! I hope,you are using lubricants of some sort while masturbating!! If not,then use lubricants!! Again,go slow,calm down!! It's gonna come to you in due time!!
Most females do have difficulty reaching orgasm,especially young ones! It's in many cases psychological in nature!! Female's sex is blocked with the negative social conditioning regarding sex!! For example,just have a look at your own view-you said : "plz dnt suggest to contact any other boy"..........The question is : why not? Are you having trouble with thinking of sex with males? If so,why so? Ask yourself,find out your belief systems,your conditioning!!
Don't worry,don't be too concerned!! Give yourself times,relax and have fun!! Everything will be alright!!