If your'e thinking about the specifics of how to make that landing, you're thinking too much.
9 landings is a few trips around the pattern. I still learn about landings every time I land. I made six flights yesterday, and learned something different each time. I've made thousands of landings. Of those many thousands, the only one that counts is the next one.
Not too long ago I operated in and out of a smallish airport in a narrow valley. It had a stiff crosswind, but also a lot of dead spots, shears, and rotors due to hills, trees, and buildings around the airport. It was one-way in, one-way out. My landings were entertaining to me, and apparently entertaining to locals who came out of their hangars to watch. Several of us were making those landings, and no one else was doing any better. After eight or so of those, I went to another airport, where the wind was straight down the runway. Some of my landings were glassy smooth. Others were decidedly not.
Maintaining the centerline of the runway is very secondary to keeping the aircraft going straight when you land. That is, aligning the long axis of the airplane with the direction of travel.
You can approach to land by keeping the airplane crabbed into the wind until just before touchdown, then kicking it out with the rudders and using the aileron to keep the wings level. Some call this the crab and kick-out method. You can also fly the approach to landing with one wing low, which is uncomfortable and silly-looking, but works. You can't get away with that on all aircraft, either. Some aircraft, like the Ercoupe and the 747 and Cesssna 195 can be flown onto the runway in a crab and landed that way, each for different reasons.
Each aircraft you fly will be a little different.
For now, if you do end up getting off center on the runway as you're approaching, try to do it upwind of the centerline; you can always drift back to it. When you're landing, especially as you begin to arrest your descent in the "round-out" and flare, don't be overly concerned about where on the runway you are in relation to the centerline so much as how you're lined up with your direction of travel. If your landing direction is parallel to the centerline, then keep the long axis of the airplane pointed that way; you don't have to be on the centerline to do that.
Pretend you're sitting on a bicycle, and ride that bicycle along the centerline of the runway. Your feet are on the rudder pedals, just like the pedals on a bike. If you ride a bicycle on the centerline, your feet go either side of the centerline. Same for the airplane. Just straddle the centerline.
A good exercise with a students is having them fly the length of the runway at a few feet above the runway. A few passes like that helps get used to maintaining altitude, but it's not that which is important here. Get used to flying down the runway, and then practice in calm winds. Keep the wings level and slew the nose right, while holding the centerline. Now swing the nose left. Keep the wings level. A few tries of this, then go fly an approach to a landing again in a crosswind, and see if it isn't a little more intuitive.
I learned about keeping my line as a kid, when spraying (crop dusting). We did a lot of it in formation, where the boss could keep an eye on me, and save on flags (markers we kicked out of the airplane to help us stay oriented in the field). Flying close to the ground and in formation didn't leave much room for banking around to change direction. While flying down the field, keeping wings level was a necessity, but changes in the crab angle were also necessary to deal with winds, or to make slight course corrections in the field. This meant holding the wings level with ailerons, and using the rudders. This is the same exercise you can try over the runway, without having to worry about tractors, standpipes, circle irrigation, or powerlines.
It won't take very much of that practice before you begin to feel right at home. For now, you need to get out and do landings. Lots of them. Try them high, low, long, short, crosswind, still, on the numbers, and so on. Only by doing them, experimenting with them, observing, learning, doing, will you begin to develop the feel you need to land an airplane.
If twenty or thirty years or more from now you still feel like your landings need work and are a learning experience with every one, then welcome to the club. That never changes.
