As Daniel said, it is not clear that you are losing. There is still lots of unclaimed territory in the center, and you have the best chance of taking it.
I share Ed's curiousity about your experience. Your style of play is very unusual. It looks like you have tried to learn the game entirely on your own with no books and no advice. If so, it is a long hard road. It's good that you finally came in out of the cold. Welcome to L19.
Below are some particular comments. I included a number of variations, showing alternative moves.
(;FF[4]GM[1]AP[gobandroid:0]SZ[19]GN[]PB[Kagishuwo]PW[Nihilo]BR[]WR[]RE[];B[qd];W[dc];B[pq];W[qf];B[oc](;W[pk]C[JB: There is a proverb that says: "corners first, sides next , center last" Your R14 stone is sort of a corner stone, so you could supprot it, but this is a bit too far. See variations.];B[dp](;W[dm]C[JB: Overall, not a bad move, just a bit too casual. See variation];B[qo];W[fq];B[fp];W[gp];B[cq];W[eq];B[ep](;W[lp]C[JB: This stone is a bit too far to really be part of your F3 group. I'd recommend completeing that group first. See variations];B[cl](;W[hp]C[JB: This does feel like a step in the right direction, but a black stone at K4 could still hurt you. See variations];B[cm]C[JB: Good move by black. It connects his stones, and makes territory. ( BTW, this early in the game, the connection may be the more important of the two )](;W[fn]C[JB: You don't need to save the stone at D7. It doesn't really do anythng for you. It is best to just abandon it. See variations.];B[fc];W[id];B[kc];W[ic];B[cg];W[ce];B[ek];W[dg];B[dh];W[df];B[ch];W[kd];B[ld](;W[mc]C[JB: If you want to attack,. don't be timid about it. See variation];B[jd];W[ke];B[lc];W[jc];B[md](;W[mf]C[JB: This seems a bit weak. As a general rule, don't use a kiema to make a connection in the middle of the board. ( Side may be ok )
See variations];B[lq];W[mq];B[fh](;W[gj]C[JB: It is not clear that this stone accomplishes anything. You can't kill his left side group. But your stone is too far from friends to be safe.
See variations];B[ql];W[pm]C[JB: This could get you split. Fortunately for you, he does not play Q8. It would hurt if he did.];B[qm];W[pl];B[qj];W[pj];B[pi];W[qk]C[JB: Good move, Separate his stones!];B[qi];W[of];B[lf])(;W[kq]C[JB: This gets a good grip on territory on the lower side.];B[lr];W[kr];B[mr];W[kp])(;W[jf]C[JB: K16 is still a pest that needs to be erradicated.])(;W[qi]C[JB: And you still have a gap over here.]))(;W[lf]C[JB: If going that direction is most important to you, this works better.])(;W[if]C[JB: But best is to keep your stones connected by trapping K16.])(;W[je]C[JB: Just killing it immediately works too. Note, now those six white stones are connected.]))(;W[lc]))(;W[ce]C[JB: Taking corner territory can't be bad.])(;W[qi]C[JB: Connecting your stones wouldn't hurt either. ( note the 2-space extension )]))(;W[iq]C[JB: Now you cannot be easily split.])(;W[cm]LB[dl:A]C[Usually when your opponent appoaoches a lone stone of yours with a diagonal move, you either play like this or at 'a'. In this case, I prefer this because it spits his stones. ( Ahhh...there's another good proverb: connect your stones, separate his. )]))(;W[hq]C[JB: Tight, small, but solid and safe.])(;W[iq]C[JB: A bit looser, but gets the job done. IMHO, this is best.])(;W[jq]C[JB: This is perfectly reasonable also.]))(;W[cn]C[JB: This is by far the most common way to approach a 4-4 stone. I recommend using it unless you are sure that a different approach is clearly better.]))(;W[qi]C[JB: If you want to support your stone, the standard 'two space extenstion' looks good...])(;W[dp]C[JB...Or you could grab the remaining corner.]))
I recommend getting a basic beginners' book on go. It will make it much easier for you.
PS: Shapenaji is so strong that he has evidently forgotton what it is like to be a beginner.
. It doesn't contest the corner properly and thus is on the wrong side. When black next plays 'b', your one stone is under a lot of pressure, and black gets to play the move he wanted to make all along (if it was black's turn instead of white's, 'a' or 'b' would be extremely big moves for him: see