i went from being 245 lbs in january this year to 160 lbs as of today... i am 5'5 i am 18 years old and have a 34" inch waist... i was wondering if i would ever be able to have a six-pac? i have some excess skin around my stomach and would like to know how to get rid of it and tone my stomach atleast...

Congratulations on the weight loss!
The excess skin may shrink back on its own if it's not too stretched out, give it a few more months. If it's still that way then the only solution is plastic surgery.
In answer to your question about six pack, yes, you will be able to get one IF you lose enough of the fat layer covering your abs by following healthy eating habits AND if you do some ab exercises to strengthen and tighten the abs. It's not "either or" situation. It has to be both. Judging from the weight loss you were able to accomplish, I have no doubt you can do the other stuff as well.