Hi LovesJesus and Welcome!
Very sorry to hear that this has been your first experience of a relationship. I can, as probably all others on this board, understand your pain and confusion. A BPD relationship is like no other. From the sounds of it you've done your research so have a better idea of what you've been dealing with. There are also some fantastic articles here that can help to answer some of your questions so do keep reading. It helps to be clear about what has gone on as you can begin to depersonalise some of the behaviour you've encountered. I highly recommend Surviving a breakup with a pwBPD (See top of this board). It helped me enormously in my detachment.
I know it hurts to find that you've been replaced so soon. It happened to me too. At the same time I think it was a positive for me because that put to rest any hopes I might have had and I took it as an insult that was like the final nail. It gave me the last bit of resolve I needed to look away from what he was doing and concentrate instead on picking myself up and doing what I need to do for myself to heal, then I can be open to a healthier relationship in future. I hope for the same for you.
I really don't know what to expect from a "normal" dating relationship since all I know is my ex. Can anyone help me with this. I am 18 years old and don't know how to move on. My biggest fear is that I will give up too soon on someone because they won't put me on a pedestal in the beginning. So if someone could explain to me how some without BPD would normally operate during the dating process I would surely appreciate it. I have been so hurt and wrecked and ruined by my ex that I'm really afraid of getting hurt again .
OK regards a normal r/s you can certainly expect a lot less drama - I'd hope! However I'd say that a r/s can be what you make it. It would be wise to think about what boundaries you'd want to take forward with you. What are your values that you don't want to move on? Writing these down could help. That way when in time you consider someone else you can assess whether they appear to respect these values and not push your boundaries on them. There is also an article here on what a healthy relationship looks like:
https://bpdfamily.com/content/characteristics-healthy-relationshipsThis certainly gave me some perspective when I compared my r/s with my exBPDbf!
Your other comments about moving on and feeling ruined by your ex I think can be helped by continuing to read and post here as you're in a place where others have either been through or are still going through the same thing. You're not alone. We all face the same challenges here and help one another on our journeys. The lessons to the right

are extremely helpful in breaking down the process of detaching and healing, as well as the five stages which will allow you to see where you are in the process. Sometimes we go backwards a little or bounce around and that's normal. Take the time you need and don't put yourself under any pressure to 'be better', as rushing things won't help you long term. Try to be kind to yourself and give yourself what you need right now. We will be here to help you along.
Love and light x