That is a very good question. And you already know the answer to it. You can't. It is impossible to accept someone else's love if you hate yourself.

Of course self-hatred isn't rational. It's an emotion, the mind isn't involved much. I think actually making it rational would take a professional.

You know the problem now to your original question: You cannot accept love because you don't love yourself.

Now that you know the problem, you must focus on the solution. And the solution to your problem is your own decision to make. Take your time. Get some alone time to think it over, or find someone confidential to talk to. Do whatever you have to to make this work for you.

If you want it badly enough, you can get it. But apathy will only lead to status quo.