Relationship anxiety

I am a 21 year old male and I have been dating this girl for a couple months now and the first month was the greatest month of my life. I have been getting these feelings of wanting to bail for the past month. Before this relationship I have never had a good relationship or had one last more than a month. I think the fear of losing her and the pressure I put on myself to make it work has stressed me out beyond belief to where I don't want to do anything. I'm scared that the feelings of wanting to bail will come back when I am with her that I don't want to see her sometimes. When I am relaxed and try to control my thoughts it is better but they are often hard to control. Idk if it is her that is causing the thoughts or just my paranoia about relationships. Help please

It makes sense that you would have some anxiety about entering a relationship when you've had a negative experience. I think it's be good if you took some time to reflect on why you're feeling insecure. That is internal, not something you can pin on another person (because they're not making you think those things). Fear of rejection is common and you can overcome it. Just try to focus on those fearful thoughts and think about where it's coming from. If you're in therapy, you can try to talk it through with them too.

When I am with her I am constantly analyzing if she is the one for me instead of just enjoying the moment and I really do not know how to stop that. Maybe when I have better assurance of the relationship it will go away but I'm just not sure

You need to realize that you are a good person and need self-worth before going to far into a relationship. "Love yourself before loving others."

I like what JJBX said too, negative feelings are a sign of something wrong most of the time. Embrace them and think back on what maybe causing them and then put a positive thought in place of them. It doesn't seem you are very aware of your feelings and thoughts.

It helps putting yourself in a calm place and relax. Do some self reflecting and it will help you see more clearly.

Also here are some helpful website, I think I am dating a guy that has similar thoughts which I'm thinking of sending these websites to:

The Difference Between True Love and Unhealthy Obsession

How to Have a Healthy Relationship

I literally have no confidence in my ability to stay in a relationship and I think that paired with my fear of losing someone so special to me is causing my anxiety but I have no idea on how to build my confidence or lose that fear. I know that she will never do anything to harm our relationship but when I wake up every morning I have an anxiety attack no matter what happened the night before.

Look more into self reflecting and awareness. There are many websites you can find. Plus assertiveness is another topic to look up; it's a good level of confidence. Not dwelling too much on the relationship helps too, think about the positive aspects and find ways to solve the negative.

Also that fear is due to insecurities that you have to find in yourself. What has happened in your past that makes you suffer with the present and why think badly of the future when it hasn't happened yet.