1) These hadiths are telling us: doing these sins makes us deserve Hell. However, if we repent Allah forgives. If we do good deeds, the good deeds erase the sins. That’s like when the law says: if you commit this crime, you go 10 years to jail. But the judge can reduce that or forgive base on different circumstances. So these hadiths say it that way to deter us from sinning. But there is no doubt if we repent Allah forgives completely.
2) If you don’t have a way to clear up those lies now, ask Allah sincerely to forgive you and He forgives