How can I become better?

Keep on practice , find an effective weapon and class that suits your gameplay , never give up !

Yes @Real_Noobalishus  Would be fun to play with a friend sometimes but unfortunately none of my friends play Battlefield. I have like only 1 friend on my Origin friend list and she doesn't even play Battlefield. I have plenty of friends on Steam but unfortunately they aren't Battlefield players either.

I should also perhaps mention that I'm not a "normal" person. I was born with a brain -related medical condition that causes many things, one of them being that I have a slower reaction time than most people. Because of that I'm always at a disadvantage in any situation that requires a fast reaction. Battlefield often seems to have these types of situations. It's not really a disability but still my brain doesn't function in the same way as that of a "normal" person.

You can try driving a tank, you can get away with taking a ton of damage. It's probably the easiest way to stack up kills in this game.

@GUTENTAAAAG I know right. I've gotten seven kills in a match at one point while I was a gunner for the tank. And that time I was playing the support class. Plus the tank got damaged real bad so I just went out and managed to fixed it, even though I was under constant fire by the enemies. I saved both the tank and everyone inside it. One of the few moments when my team appreciated me. It felt good, even though it was just a brief moment. So perhaps @Real_Noobalishus  is right when he said that getting high number of kills is not the only thing to do in this game.

Tonight I took out 4 tanks, plane, many INF, all in one life of a Sherman to capture 2 flag. Really most of the time the team needs to have a army to get me destroyed. Being good takes hand eye coordination, good controller and think about what your attack is going to be. AA gun place in good view, hide behind rock, be a sniper for AA and place spawn point. Tanks U want to keep moving fast, never sit too long. INF stick with squad that likes to fight,  view your squads kits before entering a squad, try to kit yourself to help the squad. If U go medic, your job is to heal your squad while protecting yourself. I've been  in matches where we were all medics,  our squad was unstoppable. 

If your going to ride in a tank with a good driver, your job is to keep the tank from being destroyed, kit yourself to neederneeder. If the tanker is good and work together you will live, the tanker knows your helping and will do all he/she can to keep you safe.

If you are tanking stay close to tiger or any other heavy armor, I have destroyed many tigers with staying close, ram on side of track, always shoot tanks in the gun or cannon never aim for tracks, planes stay high and scout out the battlefield, when U viewed the field start bombing, if your a fighter always equip spotting flares, stay high then dive releasing the flares, the job is to win the game.

And I almost forgot: use quality headphones. With mine I can target anyone moving close by with closed eyes.

@GUTENTAAAAG  I have Razer Kraken Tournament Edition with THX Spatial Audio support. Unfortunately I'm not still good enough to indentify threats based on sound only.