Texting during reboot

Hello.
Let's start from the very beginning. I'm shy and quiet person from nature. Because of porn I also developed social anxiety, which have had an impact on my life. I rarely talk with girls, don't like parties and so on. I most likely enjoy the silence, let's say.
I wasted a few chances to create some relationships with opposite sex because of that.
So, in real life I don't like taking up the conversations, they literally makes me feel awkward in most cases, and I simply don't enjoy it. But when it comes to conversations through internet, and basically texting I most likely enjoy that, I'm just more confident and so much better in this... My problem is, that when I often enter some websites which provides that kind of dating through text stuff, I'm literally trying only to flirt with girls. I don't think something like - "Okay, I will send her a message, and maybe we will go to date after some time". I'm afraid of that, I think that I only going to that kind of websites to just talk with them and flirt a little.
I also relapsed a few times because of that, in some cases it's ended up with some really filthy stuff and a "sexting". I see it now like an enemy, I know that everytime I'm watching profile of some girl I just tempt myself in a bad manner, and my brain releases dopamine.
Do you think that this can delay my reboot?
Also what to do when I have an urge to try some online conversation?
That social anxiety affects my overall life so badly... I'm attracted to one girl, but I'm scared to approach her, she is probably liking me too, but I'm terrified everytime I see her, even something like sitting on the bench on the school corridor is awkard for me... I will probably never seen her again, because of that situation with quarantine, that's my last year of high school. I wasted my opportunity...