I can totally relate, having just had my 3rd in 3 years - we took the kids away over Easter and i did not get out of my clothes by the pool for the 1st few days as I was too embarassed to put on a bikini - and then i found a shop that sold tankinis and I bought one and it made such a difference.
It gave me the confidence to get in the pool with my kids which was such fun.
Stretch marks need lots of body oil and massaging!