TSE, I say this with a sincere desire to give you an objective and well intentioned response. You are coming across as extremely self absorbed, selfish, and insecure. I get that you are trying to use this thread as both a means of getting feedback and a way to process your throughts and feelings. However, the only information you are giving us is "I feel this..., I worry about that..., She's acting this funny way... what does it mean?", etc. I think your recognition that you can be quite "needy" is a good self-revelation.
If you truly want to have a meaningful relationship you need to focus on understanding and meeting the needs of your partner. Lasting and joyful relationships occur when individuals put more effort into being the right person rather than overanalyzing and manipulating their partner into being who they want them to be. One of the things I routinely encourage those in relationships to do is "draw a circle around yourself and focus on the person in the circle". You can't change your partner and fighting with them over how you think they should meet your needs is a dead end. What do you need to address within yourself to be the best partner you can be? That is something you do have control over and something you can work to improve.
There is a big difference between having expectations, being reactionary, and being intentional. If you want your relationship to be a certain way then take the initiative to make it that way. Want things to be more open and honest, then you start by being transparent and geniune. Want things to be more loving, then you start by being more affectionate and encouraging. Want things to be stable and secure, then you start by routinely communicating your passion and committment to your partner. It's all about giving and serving, not taking and receiving.
If you will read back over this thread you will see where time and time again you have shared how you feel, but no where have you explained how she feels. Are you spending time listening to her? Do you understand her thoughts and feelings on the various concerns you have referenced in this thread? Maybe you are doing these things and just haven't posted them here, but if that's the case then know that you are leaving us with quite an incomplete picture of what is going on. From what you have posted thus far it would seem you are much more concerned with how you feel and whether your needs are being met. Is that how it is? Do you even know what she wants and needs from you in order to feel confident and satisfied in the relationship?
Relationships are generally the most challenging thing any of us will ever do in our lives. That being said, they are also one the most rewarding things and can be a source of immense joy and purpose.