OP your post is like I wrote it, word for word, two years ago. Please do know and do believe it DOES get better. It will get better.
I always suffered with anxiety, always. It stifled my life in a lot of respects. I'll give you an example, I stayed in a shitty rental for TEN years because even the thought of me getting a mortgage just filled me with anxiety so much I couldn't cope. I was imagining the craziest scenarios, reading about rates in the news and convincing myself it's so risky having a mortgage, I was convinced we'd get repossessed. We have two good salaries, permanent jobs, and no kids. It was 100% only my anxiety.
Obviously it wasn't just the above, that's just an example.
Eventually I was prescribed sertraline, like you I was terrified of taking it. The tablets stayed in a drawer untouched for two years.
I was resisting taking them but it became clear I had to try something aside from therapy, and I had all sorts of therapy.
Back to my lovely GP I went. And, thankfully, she convinced me that it's absolutely safe to take it. I started on the tablets, had no side effects whatsoever. I have now been on 100mg for about two years.
Omg OP will you believe me if I tell you that sertraline changed my life? I am not riddled with anxiety anymore. It still feels surreal to me but it's true. The anxiety that I had almost 24/7 since I was 15 is now gone. I happily bought a house. Instead of having palpitations when walking past a real estate agents, I now stop and have a nosey on the window. I do normal stuff!
I'm still the same person. Sertraline isn't a lobotomy. It doesn't change your personality. Please do go back to your GP and discuss your concerns. You CAN benefit from medication. Your life CAN improve. Please speak with your GP again so they gently alleviate your fears.
All the best, honestly ❤️❤️ Feel free to ask me anything if it's helpful, looking back at my reply it's a bit all over the place 🤣