You are the phrase:

CONSONANT!

I’m myself more often than not, however a 3rd I’m not

The phrase CONSONANT has 6 consonants (nearly all of the phrase) and three vowels (a 3rd of the phrase).

I’ll trick you, my boy, like an insect you caught

CON + SON + ANT

I begin, I finish, however I’m not in my center

The first letter (‘begin’) is a consonant (C), as is the final letter (‘finish’): T. But the center letter is ‘O’, a vowel.

I’m right here proper now, all all through this riddle

There’s an terrible lot of consonants within the textual content of this riddle!

As for the title:

Not solely are there many consonants on the display in entrance of you proper now, however the ‘entrance of YOU’ is a consonant (Y), and within the English alphabet there is a consonant (T) instantly in entrance of ‘U’!