Gst for software freelancer (export)

kindly someone help me!

I am a freelancer in the field of cloud services/IT professional, 

so I am also self-employed right? I export my service around the world, and thats under 20 lacs so I know I m not under GST but ,

If I want to apply for any registration certificate for my freelancer/self-employed = sole proprietor?= msme?

can I apply for udhyam or similar reg.?  or any other such certificates, please