I've had powerfull experiences where i was absolutely convinced that god was speaking to me, where i felt i was in the presence of god.

Yet i am a sceptic as well.

So i may believe or feel certain things, but at the same time i will always have these doubts.

I believe in things, yet i doubt them. And i don't consider that to be a contradiction at all. It's just realising that you can never be sure.