I would lose the bit that says I might not be good looking etc, off putting and not selling yourself!
Other than that as a single bloke you will need to stand out, and take some knock backs and move on
Send nice polite messages, and don't get disheartened if you don't get responses.
Expect nothing
Saying you don't care about looks or size sounds a little desperate.
Telling people they should reply to your messages sounds needy and no one really has the right to ask that anyway.
Find yourself a nice bi-curious girlfriend and go to clubs together.
You should do very well then.
Otherwise get onto organised party guestlists and make the break in that way.