There is a balance between thinking about who you want to be and accepting who you are. As an example: one of my bad habits, which I exhibited on this trip to the mountains, is attributing to other people my worst feelings about myself. I was frustrated that I had to call the trip short; I felt that I had let my husband down. And because I felt that I had let my husband down, I reacted emotionally to his perceived frustration with me, which was actually my perceived frustration with myself.
I have, luckily, lived with myself long enough to catch what I was doing about ten minutes in, as I was grumpily hiking around the lake. Imagine me with little black cartoon storm clouds over my head, making myself mad with my own negative thoughts, stomping around a really absolutely beautiful little woods bordering a body of water up in the mountains.
After a while, I realized the utter absurdity about being annoyed when I could be appreciative, and I talked to my husband, and he was indeed not thinking any of the horrible things about me that I was thinking about myself: he was not thinking that I was a terrible burden; he was not thinking that I was wimping out. He understood that I am injured, and he doesn't think it's my fault, because that would be weird and illogical and cruel, and while he is a big weirdo (affectionate) he is neither illogical nor cruel.
That was all just me. I was being illogical and cruel to myself.
As I said, there is a balance between thinking about who you want to be and accepting who you are.
I understand that it is important to love myself: I try to do so in many ways. But there are times when the not doing so sneaks up on me and I realize how very bad I am at it. Being bad at loving myself is not just a me problem: it makes me more reactive, which makes me less kind. It makes me hold myself to impossible standards on the one hand, and excuse myself from meeting possible standards on the other, because I systematically undervalue my capacity.
Self-acceptance doesn't mean accepting the worst version of myself that I can invent in my head. It means recognizing who I am and growing, one tiny piece at a time.