I just don't want to deal with any mess. I have never been a really out going person so I think that this part of my life is over.
Many, if not the majority of people who seem to get involved with BPDs would rank high on the introvert scale (including me).
Many, many of those people had healthy relationships prior to their BPDex and have gone on to have healthy relationships after it (including me).
So I would actually
agree with you that there is a very high probability that, 'that part of your life is over'.
Just not in the way you are suggesting.
Allow yourself time to heal. Take time for you.
When you'll be ready, you'll be ready.
Don't worry about that now.
Later, it will be clearer... .but these painful feelings are going to actually help you to find a much healthier relationship in the future.
Right now - focus on feeling & healing. Recovery is a struggle and it takes time - but you
will make it.