I can write a book on the topic. I'm attempting to refrain from that.
0) "What do you want" is the question. There isn't a deeper question behind it. Pretending that there is a deeper question is just one of the self-sabotaging ways we avoid answering the question.
1) Investments aren't sacrifices. If you want to, say, lose 50 pounds because of Your Reasons, then you are investing your attention and your non-renewable time in accomplishing what you want by eating/doing things that make that outcome more probable. You are not "sacrificing" chocolate cake and icecream and whatever.
2) You sacrifice things that you actually have/do and which are valuable to you. Since you can't have or do everything, and since things that take you away from what you actually want are not valuable to you, then you aren't "sacrificing" anything when you "give up" things that you couldn't actually have or do, or things that aren't actually valuable.
Everything is a choice. Choices involve tradeoffs. That is a fine, rational way to view it if you must view it in some way. Framing it as "sacrifices" dramatically increases the likelihood of failure, poisons your own emotional relationship to the process, and sours your feelings toward the goal itself.
In some people it also tends to promote a false narrative that "sacrifices are necessary", but that's heading away from my own goal in commenting. So. :)
