You aren't using any form of defense at all with that, literally with that technique and habit you'll get starched by a lead right hand, starched by an overhand right counter off the jab, starched with a pick and stick left hook, you just aren't protecting yourself at all with any movement there. Your hands aren't high enough, you aren't bringing them back to ur chin, you look like you have a degree of natural speed, but you are removing the effectiveness of that speed with an extremely obvious tell you are going to jab, everything stiffens for a split second and lulls before you shoot. a hesitation is there. Which means you can be timed very easily, and timing destroys speed every time. A very slow fighter with no tell will be considered faster than you with your current tell.
That's not even the biggest issue though - the big issue is your lack of proactive defense in any way shape or form. You are open to be bombed out at a moments notice. You aren't in position to counter, you are wide open, and you can tell when the jab is coming, so whats to stop a power puncher from just deciding to run you over? No look left hook and its done because of ur lack of proactive defense. Since you don't go back to a countering position, there is zero worry. You aren't giving anything after that to give a hint that you are dangerous still.
Pick the jab and dropping the right hand over it is an extremely dangerous counter you are extremely open to aswell if you continue practicing like that. its so loose ur hand could easily be parried away and a right hand could be sent to target every time.
Go to a gym and spar with some beginners - every mistake will be made extremely obvious then. Then you can fine tune to adjust and make urself better.