I think it's also helpful to realize that there are often going to be times someone -- like awesome1122 -- feels more positive, and other times when it's a bigger struggle.
I know when I look back on my own life and my relationship to my body, I had a very hard time in my early teens, but a very easy one in my late teens and early twenties, then a crappier relationship with my body in my late 20s and early 30s, and then probably the best relationship I ever had with it in my early to mid-thirties. Then I developed a bunch of chronic illness and pain, and that did a real number on me with how I felt about my body (including because all that pain and illness made it very hard for me to be as active as I like to be, and being strong and agile has always been part of my best feelings about my body), and THEN I started dealing with mid-life aging in my forties, and boy, has that been a whopper (and it's less about how I look and more about how I feel physically, which no one really tells you will be an issue, they're always just talking about looks).
But I can say, looking at the 45+ year view of all this for myself, that I feel like I have had an easier time even with things and phases I see really wrecking my peers relationships with their bodies, because of a level of acceptance I developed over time, which was a huge part -- if not THE biggest player -- of how I felt about my body when I felt best about it, in my 30s. I wish someone had told me how much easier things would have been had I developed it more even earlier, when it's truly so much easier to do. I wish that I hadn't wasted time earlier without that acceptance, because I know it did limit my life and my enjoyment of my body as a vehicle for my life. And missing out on that kind of time during earlier life phases when you have more energy and freedom to live is a serious bummer.
I feel like as I get older still (we all live in a world where youth is so tied to positive presentations of bodies, it's only ever going to get harder as you age), and find fewer and fewer positive representations of just aging bodies -- sans plastic surgery, botox, and all that business that's both outside my economic class, but also outside the way I personally want and choose to live my life, even if I could afford that stuff -- even ones where people don't have illness, that learned acceptance is going to be EVERYTHING.
So, that acceptance, more than what I look like at any given time, what others may or may not think about it, or even what I'm able to do with my body, is what I am being sure to keep a very tight hold to.
TL;DR: From this getting-older person to you, my best advice is to do what you can to work a lot of this out sooner, rather than later! Not accepting our bodies is just such a hideous and silly -- even though it's understandable to struggle with it in our body-negative world -- waste of everyone's time and energy.