Hi,

I played this game recently and I feel I was behind right from the beginning. I'd appreciate any tips. (I'm white)

i will comment on first obvious mistake you made.
at your level it might not be clear but..
22 should be S6.
givingup the corner was too big.

overall you are not seeing what is big.
i seen many plays that are only few points big and neglect big points.

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"The more we think we know about
The greater the unknown"
Words by neil peart, music by geddy lee and alex lifeson

A few ideas:

Thank you guys for the comments. Now I know what to work on.

You did not play any explicitly bad moves. But you played a number of small moves that were clearly not as big as other possible moves. While no single such move is enough to cost you the game, collectively they gave it away.

You seem over-focussed. When the play is in a local area, you keep playing local moves almost by rote. And you miss big moves elsewhere. It is usually your opponent who tenukis.
Step back now and then, look at the whole board, and ask yourself if there is a big move that you can play elsewhere without getting killed locally.

Write 'tenuki' on the back of your hand so that you will see it every time you reach for a stone.

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I like to give you one simple idea that will make your game much stronger. Of course as beginners, we make a lot of mistakes. But we can not get rid of all of them at the same time, right? So try one of the biggest one that is probably easy to grasp:

One that you can learn from the other excelent discussions here is that of free areas. Just look where is more space. That is always more interesting.

And the first area where you make points are corners. In your studies and in your games focus a lot more on the corners. Here you didn't really manage to make points out of one single corner.
Happily these all here are 4-4 points. These have three areas to make points. On their left and right sides and behind them directly in the corner.

If your opponent approaches one side of one of your 4-4 stones, then you normally just take the other side, making points happily, and peacefully there. If he comes from the other side, well then you take this side. The same is true if you try to approach one of your opponents corners, normally you try to make points on one side, accepting that he makes some points on the other side. But if he is on both sides, like in the lower left corner, then you don't want to approach from the side. You want to go in on the 3-3 place, making a small living group that takes away a lot of the opponents possible points and that hopefully in sente (there are some variations that you just plain and simply need to learn). A protection against this (if you want to stop an opponent from invading on your corners 3-3) is the way black defended the upper right corner. Here the stone at R15 is just too close to a 3-3 invasion. An invasion could not make 2 eyes here and would just die. The same you could have done at some point (actually quite early doint this would be great) with your corner in the lower right. Because actually that was your corner and it could have made 15 to 20 points. Responding to move 7 with E3 will lead to an interesting joseki (followed by wE2, sD2 and wM3 or in this case maybe wN3).

That is for basic tactics to handle corners. But focussing on the corners means more. It means, that always when none of your groups lifes is threatened and none of your corners is just approached by your opponent, then your idea, your plan, yes, your hearts deepest wish must be to approach an unapproached corner of your opponent or defending one of your corners against one possible opponents approach (preferring to defend one side comparing to defend the corners innards).

If you learn to instinctively hunger for corners (strategy) and how to basically handle corner approaches (the according tactics) you will be more then one or two stones stronger, hapily keeping all your other mistakes.