I was folding hands like QJs,A7o,JTs and etc thinking that I'll get dominated mostly, but from now on will reshove those type of hands. Thanks a lot for advices.
It is villain dependent, but try plugging some some hands into equity calculator to see what kind of preflop equity you have if called.
I gave villain a pretty tight call range of A2s+, A10o+, all suited broadways, and 55+
vs QJs, ~40.5% equity
vs A7o, 36% equity
vs J10s, 38.5% equity
Keep in mind that the wider the call range, the more equity you pick up. I'd be jamming a much wider range like anything suited or anything connecting, suited or not. Using the same range, lets look at some hands I'd shove for 7 BBs:
vs K3s, ~34.5% equity
vs 45o, 30% equity
vs 22, ~40% equity
So, I'm not that much of an underdog even though I'm shoving a fairly wide range. Even if villain has a much tighter call range of JJ+, A10s+, AKo, we're not that far off.
vs QJs, 30.5%
vs A7o, ~26%
vs 10Js, ~29.5%
vs K3s, 28%
vs 45o, 28%
vs 22, ~35.5%
As you can see, you're only a ~30-40% underdog, which is never a bad spot to be in as a severe short stack. Even if their call range is QQ+, AKs, in most situations, you have at least 20%+ equity preflop, which isn't terrible.
As a personal rule, when I'm a severe short stack, I'm looking for more spots/reasons to jam than I am to fold. Sometimes, in my opinion, it's better to push your luck than it sit and wait for a big hand. Of course it's mighty silly when I'm open jamming73s and beating KK that snap calls, but that's just how it is. I'm not getting anywhere by just folding and I can't win with a little bit of luck.
Obviously, the more BBs you have, you can have a tighter shoving/reshoving range but you don't necessarily have to wait to get down to a specific amount before making certain plays. For example, having 15 BBs is virtually the same as having 10 BBs, so if a lot of situations, if you're shoving 10 BBs, you can shove 15. As you move up in BBs, you can still be considered relatively short but with more flexibility. 20-25 BBs is a very flexible stack but it's, not a large stack by any means. You obviously don't have to open jam a hand you would if you had 10BBs, but you can't be opening as wide of a range. As a general rule, with 25BBs or less, you should only be playing hands you would be willing to get in preflop.