Change is pretty much always possible [and I only say pretty much to avoid outlier circumstances like an incurable painful disease].
The questions are moreso 'will change happen,' 'how much change will happen,' 'will it be enough?'
I realize [my suicidal feelings] are the truth or else I wouldn't have had them more or less since 5th grade.
The wording is interesting. (and I'm not being pedantic. The internal script and word choice we use is of immense importance.)
How can - or when are - suicidal feelings "the truth?" Literally, a suicidal feeling just means you want to commit suicide, so I guess because A = A, yes, the feelings are true. They are real feelings and desires.
But the way you use truth, to me, suggests that suicide is a cosmically, objectively,
correct choice. That's a bold claim. Honest to god I don't think literally anyone can be sure if suicide is the right choice, not 100%. That's both for measurable reasons (things could change/get better) and for more spiritual reasons (it's a sum of pain v. joy the proper determining factor?)
Life has a lot of harsh realities but also a lot of nice things. I can't tell you which one there's more of, but you can change in the sense that your life has more nice things and less harsh things.