At the beginning of the game both sides are equal that is neither side has an advantage. White may appear to have an advantage because he or she gets to move first. How are you playing as the black pieces? The point of playing black is not to go on the defensive well not entirely. Otherwise you will just be defending against threats without serious ones of your own. Beginners under 1200 should not need to learn openings in my opinion. Just openings concepts.
It is perfectly fine to respond to e4 with e5 and d4 with d5.
I have looked at your 15/10 game against a higher rated player. You should not have resigned so early in the game. Not knowing what to do is not a reason to resign.
Below is a great video by IM Daniel Rensch on playing the French Defense
https://www.youtube.com/watch?v=6IjmZ7DL20o
Hope this helps!
OK, so upon playing and learning from different game sessions, I realized that I'm better playing as White than Black. Maybe it has something to do with that theory where White mostly wins because he goes first.
When I play as Black, I mostly try to do aggressive premature plays, only for them to fall short while White obliterates my position. I can't seem to grasp the concept of how Black SHOULD play. Or am I being delusional?