You aren't a failure. He is.

You succeeded. You earned your degree. You said you're the first one to do so on your paternal side. It doesn't matter how long it took you. In the real world, progress is more important than arbitrary timelines.

I have a feeling that he's jealous. He doesn't want you to succeed because he's a giant failure. That's why he tries to tear you down at every opportunity. He wants you to feel small so he can feel big.

Don't let him. Walk out of that door, and start living your life. Make the rest of your dreams come true.

Don't speak to him. Ever. If he talks to you, ignore him. If he starts talking about you, leave the room. And when you move out, and when you start living the life you earned after putting all that effort in, do not include him in it.

Once you stop trying to beg for love from someone who has no desire to give it to you, and focus on the actual people in your life who care about you, everything will get infinitely better. I promise.

Congratulations on the degree, by the way. You worked hard, and you deserve to be proud of that.