Does the game feel too hard on offensive?

Some maps tend to be skewed towards the Offensive team and some are skewed towards the Defensive team, but even then specific points along the map can be individually skewed to be harder or easier to defend so it's a real mix.

As stated elsewhere the ultimate composition of your team affects your chances of success regardless of whether you are Defense or Offense an the skill level of the individual players has a large impact as well along with how those players participate.

I've been in plenty of games where the offensive team didn't play aggressively enough, preferring to stand off and snipe from a distance, only to make a desperate rush to capture the point at practically the last second only to fail. By the same measure I've seen plenty of defensive teams scatter off with the intention of sniping or hunting lone members on the attacking team while leaving the point completely unguarded which leads to it being captured quickly which can lead to a domino effect since the defense just can't get it together. Both are examples of players not playing to the objective.

In cases of a tight, solid defense happening you can have a real run for it as the attackers and in those cases you shouldn't be afraid to change up your character class to try to crack the defense in a different way even if it is just for a few minutes before you switch back to your favorite again can make a difference. There's also a tendency for players up against a solid defense to keep throwing themselves into the meat grinder rather than seek an alternate route or try a different tactic; how many prolonged bloodbaths have some of us seen over an attacking team determined to set up, or continue using, a teleporter even though the defense has that area locked down tight?

Some of it is the map and some of it is what characters are being played, who is playing them and how they are being played.