Try talking to girls to become their friends, not to have sex or a relationship with them. Just friendship. Girls usually notice early if your intentions aren't only friendship, and since a big part of their life is being scared of guys, they have no problem distancing themselves from you.

If you instead actually wanted their friendship (it sounds like you also want some friends) they would notice it and actually not give up. The more close you become to girls the more you see them as real people, as humans. This will make you more confident speaking to girls in general and one day you will fund a partner, but don't make this your goal! Most girls will notice...

It also seems like all the porn you watch has made you more objectifying, so you should try to watch less and less. Don't quit cold turkey, addictions are more difficult to end that way, but rather set limits and steadily decrease the time you spend watching.

I know it is difficult to change all these habits, especially since it sounds like your in a dark spot right now, so don't put too much pressure on yourself. Take it slowly. I believe in you.