After attempting to make life better it is not working despite 2 years of volunteering, gaining qualifications, taking medication and therapy - Do I have the right to end my life?

I want to hopefully permanently change my situation through a final act

(Stop reading if potentially distressed.)

After attempting to make life better it is not working despite 2 years of volunteering, gaining qualifications, taking medication and therapy - Do I have the right to end my life?

I am feeling rational. I gave myself a time limit of a few years. Due to multiple factors like many people I have limited prospects through it all being about money.

I feel calm about it but I want to do it as I feel very tired of trying.