Abra,
I would say its the fear of the unknown… let the rishta’s visit you… its not like you will be asked to marry the first person that comes to your home ! right?
have faith in your parents and yourself and let the ball roll … with time , you will feel more confident of making the right choice… I remember in my case it took me about 6 years ! people came and came and came and i never liked anyone …
eventually mom dad almost gave up ! and i thought they were going to tie me up and get me married !!!
But eventually i did find a good family , the experience of meeting so many people only gave me a better eye to choose the right partner … and I must admit i was so nervous with one of the rishta’s that I actually missed the chair that i was about to sit in and fell on the floor ! 
but after a while I realized its not like THEY have to judge me , its me who has to make the choice … and that made me alot more calmer and comfortable with people… 