Yes these things could be related to BPD. Sounds like you need to work on your confidence. I see your 20 and personally, I remember that being a chaotic time for me. I am now 32 and I can say I am better than what I was when I was 20 so maybe you will find your confidence will grow with time.

I have BPD also and although things are better than what they were at 20 (confidence) I still struggle. But if things carry on the way they have, I hope my confidence will keep growing. There is hope.

If you're not already in therapy, I would recommend you enter it. It has helped me LOADS over the years and maybe it can help you too.

I believe before we are truly able to love someone else and be happy within a relationship, we must learn to love ourselves first.

All the best