"All changes, even the most longed for, have their melancholy for what we leave behind us is a part of ourselves. We must die to one life before we can enter another."
Anatole France, late 19th/early 20th century French poet/journalist/novelist.
More often than not doors must close before new ones can open.
What is must cease to be to make room for what will be.
Make certain what you want is worthy of replacing what you have.
Then, when you are certain, work hard, plan and execute your plan, move on to a new and hopefully better future.