Hi. It's encouraging to see that you have awareness about what your partner might not like in a relationship ( for example, your tendency to be possessive about your partner). All relationships function based on contributions and attributions of both the partners. One person might be possessive and other might be easygoing. For a relationship to be stable, a delicate balance needs to be maintained between these characteristics. And this balance can only be maintained if both the partners are willing to do so.
Next Steps
You should try speaking to your partner about your concerns. It can usually help to write an email or a letter to be able to coherently convey one's feelings and thoughts. Your second option can be to consult a psychologist to gain clarity about what you want from your partner and your expectations from a romantic relationship. Good luck and so feel free to consult me for any other questions you may have!
Health Tips
Open communication in a relationship is the best way to sort out conflicts and determine whether the relationship is worth being in.