Hey @Pratapgavali6, welcome here!
I don’t have friends because I’m very shy and whenever I’m going outside I just can’t able to walk confidently very shy and always feeling guilty and sorry for myself without any absolute reason and because of this reason I don’t have friends sometimes I’m thinking about to do suicide.
I’m so sorrry to hear that this situation has brought you to think about suicide. I hear you though. Being shy, introverted, and just anxious about socializing can feel like an unbearable weight on your shoulders. I’ve been struggling with self-confidence on a daily basis and was told that I was just “shy” as I grew up. Anxiety is different though. I can’t count the amount of times when I just cancelled plans with friends because I was too anxious, when I found excuses so I wouldn’t have to do a presentation at school because the stress that I felt was so intense, how many times I just pretended I wasn’t at home is someone knocked at the door. Just automatic reactions of avoidance.
When you’re having a hard time with seeing yourself as worthy and valuable, it gets hard to connect to others without feeling like you’re taking a risk. It feels like whatever you’re going to do or say, it can’t be well received or appreciated by others. If you are constantly seeing your flaws, why the people around you wouldn’t see the same? It’s a logic that we probably fall into too often, unfortunately.
I don’t have confidence to talk to people because I’m 20 yr old but my voice is still like a kid I sounds like a small kid talking to someone and very low voice I just can’t able to talk.
And then people saying are you girl.
Oh friend, this is not your fault. I don’t know if that can be of any comfort to you, but I have a very low voice too. It’s just automatic, and people often ask me to repeat what I just said before… which can be frustrating for everyone. Being introverted and having a low voice often goes along. It doesn’t mean it can’t be improved, just that what you are describing really makes sense, and you are not at fault for it. It doesn’t make you weak or guilty of anything. For some people, being confident is just more difficult than for others. It takes time.
Because of the inteovertness I got a bad I’m feeling shame to tell but I think if I will not share here then no one will help me to get out of this and the habit is…
I… I have habit of… Mast**b ****n habit please help me out of this and this is one of the reason which encourages me to do suicide
I think it takes a lot of courage to share about your habit of masturbation. I understand that this topic can be uncomfortable to share and probably misunderstood by many people, but know that no one will ever judge you here. It’s definitely part of the things that can give a kind of relief, both emotional and physical. When you’re almost always nervous, anxious or convinced that something is wrong with you, it really makes sense to turn into those things. But know that it doesn’t make you ugly or guilty either. As for any other habit, this is something you can learn to change progressively, but it will probably require for you to work on yourself more generally and build this confidence that you need.
this is one of the reason which encourages me to do suicide please help me to build my self confidence so I can prove myself in public.
Learning to be confident takes a lot of small steps, and you’ll certainly need to be patient with yourself as those things are not going to change in a day - but it can, 100%. You are not doomed or stuck to feel that way. Have you ever considered counseling or therapy to talk about those things with someone and receive concrete advices/exercises from a professional? Or more generally, what about looking after some written resources (books, online blogs, worksheets, etc. about social anxiety/self-esteem)? There are steps to take, and it can be incredibly powerful to receive professional help while taking those. Suicide is not the answer friend. 
I’ll leave here some of the resources you can find here on HeartSupport. I might be worth it to have a look at it, even just to realize how much what you are going through is nothing to be ashamed of, and something that is actually relatable to many people. You are not alone. You are not weird.