You might want to change teachers. I started at 40 (now at 66), self taught, and developed a lousy, tense technique. After having several teachers who did not help very much, I found one who started me right from the beginning with wrist drop exercises, two-note slurs, very slow scales, etc. It took a couple of years, but my technique became much more comfortable and relaxed. For the last few years I've been giving yearly house recitals and playing in churches and nursing homes. I can't play the real technical virtuoso stuff, but I've performed a bunch of Bach from WTC and the Suites, a couple of Beethoven sonatas (Op 2 #1 and 14#1), lots of late Brahms, the Schubert Op 90 Intermezzi, etc. A good teacher makes all the difference in the world. There are lots of teachers who've run across adult learners who want to play Traumerei or the Moonlight Sonata 1st movement and want to get right to it, and give up on the basics, so there can be a certain bias against adult students in some quarters. But several teachers who post here have had adult students who've progressed very far relatively fast. It's not impossible.