dude I know that feeling, im a blue 4 stripes, been grappling around 4 years... when I first got my blue, I was fuck, I dont feel like a blue, that was part of my insecurity to deal with biggers stronger people, im about 165 pounds, 5'7, so I have to deal all the time with people bigger than me, eventually you will start doing better against them, one of the reason why I love no gi much better is because size and strength dont matter as much as in the gi (at least for me, some say the oppositve) I can escape much better and use my speed to get to the back o move around... hate when elephants grab my gi, its a fucking pain in the ass to break their grips...
I think I was finally feeling confidence against most size noobs around 2.5 years or so...