I remember what my body/life was like, sure. Sometimes I look in the mirror and still think about how drastically different I look now than I did back then- that's even stronger when i'm in bed w/my lady. There are certain things that I've simply "forgotten"- the precursors to getting your period (the horny day, bitchy day, back pain, blood progression), how much underwire sucked. Things like that.
i went on T to stop my period because it forced me to live in my physical body for one week a month instead of living in the male one that was a bit of a delusion at the time. Of course i was nervous, but I told myself (and still do) that the second it isn't worth it to me or I feel like I'm done, I'll quit injecting. I *love* how much control self-injecting gives me and i did a quick check-in with myself before I injected each time for probably the first six months or so. The fear/nerves are normal.