No one actually knows. Just be yourself is the best advice really.

Thanks, I'm just scared and intimidated I guess.

Just start talking to the one you like. At one point you should tell him/her.

Once I was feeling so odd and I didn't feel like doing certain stuff because I felt it wrong to the one I liked. I talked to my friend and he said, "Dude you have feelings for this person. Just ask them if they have feelings for you too." I did and turned out he/she had the same feelings for me.

Oh no I know they have feelings for me, they've expressed it and asked me out and all, I'm just afraid of messing up and I feel like they're too good for me most of the time. So I'm more or less just afraid that they'll think lesser of me someday I guess.

Go for it. You got to take the chance.