well i did start BJJ last week and while it is interestning i do feel that my height 170cm (5.5) is making problems for me. everyone in my class is much taller than me and i suspect the closed guard for example is horrible against someone alot bigger than you unless im doing it wrong and im to easily tossed off sometimes. any suggestions on good Choice of tecniques/strategies against bigger grapplers? btw nobody there is stronger than me so strenght isnt an issue but i rather depend on tecnique than strenght