Recently when i have had sex my vagina begins to tighten up and clentch. we switched condoms but we werent having issues with it until recently. ?

Vaginismus: This sounds like vaginismus (painful involuntary muscle spasm of vagina, limiting penetration). It may be psychological, but has good chance of resolving on its own, since it is fairly new. Vaginal dryness or fear of pain can contribute. Have partner try lubrication and go slow. Address any fears or concerns in the open. Don't allow yourself to feel pressured. Try relaxing with a warm bath prior.