Yeah, I tend to have the same problems too but I'm gradually improving. I play Lambda and the goal *is* to run away a lot so she may not be the right character for you. When you're blocking, just focus on getting out of the pressure. You can either dash back or look for a solid reversal to stop their pressure.
Idk but IB is hard to do online, imo. Still working on that.
Also, when you're under pressure, DO NOT PANIC. I've had instances where that happened to me and I died in a matchup I could have won if I kept my cool.