Tips against Street Fighter Characters?

Being a Tekken player, I don’t have that much trouble against tekken characters but when it comes to certain Street Fighter characters, I get destroyed. Rufus and then the lame style people play when they use ryu/ken/sagat/akuma has always bothered. I use heihachi/hwoarang and people that just back up all day give me hassles. Also against Rufus and sometimes hugo, I have a hard time seeing the gaps between attacks so i can get out or counter, especially against rufus’ dive kick.

Please ask for advice on matchups on the specific character boards.