Hello Friend, Good that you are seeking a help here. When you are confused and indecisive, its better to ask for help and you are doing the right thing be approaching for help.
Marriage is not just getting the knot, it more about common achieving common goals, interests, career, children, finances, family handling etc.
So you may need a Pre marriage assessments done through a counseling support to figure out how your are ready to accept and adopt this need. Similar, in such assessments you will also find out the reason for your stress and anxiety.
Next Steps
Feel free to reach out to me online through Practo app or f2f for a detailed assessment and to explore suitable solutions that you can follow. You will be alright soon.