Salam..
We all have doubts. Even Rasulullah had doubts. While having doubts is good to keep us in check, but over contemplation of it may cause you to freeze, meaning you 'analyse until you paralyse' and that is not good.
Know one thing.. or two things.. Allah is Most Merciful and Most Forgiving. If you crawl to Him, He Runs to you.
I tell myself this; I cannot control my heart's desires or feelings but what I can control are my thoughts and actions. There are days when I feel lazy and my desire is to do other things but I can choose to indulge in laziness or get up and sort out what needs to be done and do not get involved with the internal debate, so to speak.
We are commanded to pray 5 times a day, and it is hard to believe that anyone will willingly want to do it every time for his entire life. So, we either do it willingly or unwillingly (still doing it) and not not doing it.
Ultimately, everyone is at a different place. I have no doubt with regards to Allah and the deen. My only problem is worldly matters. It is enough to distract me. When my eeman is low, it just means that I loosen my principles a bit, it does not mean that I forget Allah and the sin. Perhaps for that moment I (from the lack of comprehension) I resign myself to the consequences.. But I don't lose faith. Don't lose yours.

eace: