There are many answers to what is the meaning of life. Lacking some important aspects of life like family, career, etc. because of past decisions, or losing someone dear may put anyone in a situation where they question the very meaning of life and even when things are all fine we look for a purpose to make sense of things around us. Some philosophers look at this question and argue for passion, some inner peace. Frankl says one needs to seek their own meaning of life. Find whatever it is, make it meaningful for you and hold on to it.
If you are in a dark place do yourself a solid and try reading Frankl's book mentioned by OP. Reading about Montaigne's life (there's a recent bio book about him) may also help. Seneca's or Marcus Aurelius's writings will also help when it particularly comes to the issue of how worrying too much about things we can't control affects us. Every living breathing soul has their own demons and issues with life, you have yours so most importantly go easy on yourself.
If you are in a dark place do yourself a solid and try reading Frankl's book mentioned by OP. Reading about Montaigne's life (there's a recent bio book about him) may also help. Seneca's or Marcus Aurelius's writings will also help when it particularly comes to the issue of how worrying too much about things we can't control affects us. Every living breathing soul has their own demons and issues with life, you have yours so most importantly go easy on yourself.